Evolution

Hi,

So today, I am going to talk about evolution. We have mentioned this before in our Galapagos Ecosystem series but we’ve never gone over exactly what it is.

So before Charles Darwin thought of his theory of evolution, the majority of people in Europe thought that all species were unrelated and that humans were not related to animals. This was mostly based on Christianity. Darwin studied hundreds of different species and on the Galápagos Islands, he first started to form his theory of evolution.

Darwin's theory of evolution by natural selection, as it was later called, is best explained by the example of the giraffe.

Let's assume that giraffes have short necks (as they did many centuries ago). Now a mother has two children. By chance, one has a slightly longer neck. This is a coincidence. As the giraffes feed on the lower leaves of the trees, these slower disappear. There aren't enough leaves for the giraffes. Thus the giraffe with the shorter neck soon starves to death and only the giraffes with longer necks survive. They then have children who also have slightly longer necks. This continues which means that over many generations, the giraffes develop longer necks.

Examples of evolution can be found everywhere. Probably the best known is the extremely fast evolution of the Galapagos Islands. A diverse number of species developed in just a few thousand years. Apart from that, the evolution of diverse animals in the whole world is very fast. If you imagined the whole history of the earth as a day, life only evolved enough to come onto land from 9pm to 10pm. So all land plants and animals only evolved in the last 2 to 3 hours, while humans only turned up at around 11:58 pm!

Thank you for reading!

Your Green World Blog Team💚

Image:

Charles Darwin: This image, owned by Corin Royal Drummond (on flickr.com), is licensed under CC BY-SA 2.0.

Sources:
https://www.britannica.com/science/evolution-scientific-theory
https://en.wikipedia.org/wiki/Evolution
https://www.nationalgeographic.org/topics/resource-library-evolution/

Comments

Coral reefs

Hello! We would love to introduce you to the topic of coral reefs and especially coral reef bleaching, as it is a greatly ignored but certainly significant topic. Have fun! 5 coral reef facts 1. The Great Barrier Reef is the largest living structure on the planet and is 2300 km long! 2. Less than 0.1% of the world's ocean surface is covered in coral reefs. 3. At least 25% of all marine animals live there. 4. Coral reefs are often known as the rainforests of the ocean. 5. In 1 square kilometre of coral reef, up to 35 tons of fish can be 'produced'. The 5 biggest coral reefs in the world 1. Great Barrier Reef (near Australia) 2. Red Sea Coral Reef (near Egypt, Israel and Djibouti) 3. New Caledonia Reef (Pacific Ocean near New Caledonia) 4. The Mesoamerican Barrier Reef (near Mexico, Belize, Guatemala and Honduras) 5. Florida Reef (Atlantic Ocean/Gulf of Mexico near Florida) What is coral? Coral is actually made up of small anim...

Photo Essay || Iceland Series (part 1)

Hi Everyone! I recently went on a school trip to Iceland! It was such an incredible experience (and I'm going to sound cheesy now) but it was also incredible to do it with some of my closest friends! I saw so many incredible things and learnt so much, so I couldn't resist sharing a little Iceland mini series of posts, all about Iceland, both my experiences there and what I saw, but also the way it uses geothermal energy, and the animals, natural landforms and plants that are there. Today I'm sharing some photos of my trip. These are all photos I have taken, and are also the highlights so please bear that in mind as you browse these! I hope it is interesting and inspires you to book a trip to Iceland! The blue lagoon <33 landscapes.... Lost little farmhouses a...

18.10.20 Animal Of The Week: Sloth

Hello, Sorry this didn't come out on Sunday as planned but this week's animal of the week is the sloth because the twentieth of October is Sloth Day. Habitat The sloth resides in Central and South America. It lives in the rainforests there and occasionally drops into the water for a bathe as, believe it or not, they are actually excellent swimmers! Diet Sloths eat leaves, twigs and buds which they find in the rainforest. As they don't have incisors they smack their lips together to make leaves more digestible. Sloths can survive on relatively little food as it takes a while for them to digest it. Sleep and Speed When you think of a sloth, you probably think of this slow, sleepy creature. They actually sleep for about 15 hours a day! Sloths have an extremely low metabolic rate (what basic calories your body needs to survive), which means they move at a slow pace through the trees. On average, sloths travel 40 yards per day ...

10 animals on the edge of extinction you didn't know about no.5 - rice's whale

Welcome back to Green World Today we're exploring the Mexican gulf and a rather unknown whale species called the rice's whale (Balaenoptera ricei). The name doesn't have anything to do with cooking rice, instead, it's been named after Dale W. Rice, a cetologist. Rice's whales are found in the northeastern Gulf of Mexico. They were originally considered to be Bryde's whales, due to their almost identical appearance until genetic analysis in 2021 determined that they are their own species. They are still often known as Gulf of Mexico Bryde's whales. In April 2019 they were listed as endangered by the NMFS under that name before it was officially changed in August 2021. They live in waters about 100-500m deep off the coast of Florida and although their diet is unknown, suspected food contains lanternfish and hatchet fish. They do not migrate and remain in the same waters all year round. Due to being such a recently confirme...

Turning waste into valuables

Hi, So this post was requested on Twitter after our September Top Tips about recycling . Today we will be talking about how to turn complete waste into something reasonably valuable. This is basically a form of upcycling but to a more extreme level. 1. Ecobricks So, almost a year ago we did a post about ecobricks , but they are such a good example of turning waste into valuables that we decided to put it here anyway. Ecobricks are a building material made from plastic. The waste plastic is washed and then compacted into a clean plastic bottle (also waste). The bottle becomes very hard and durable. Multiple bottles can then be used as bricks and cemented together. The 'bricks' are strong and do not decompose. For more info, read our post where we go into more detail. 2. Metals Although this may seem like something not worth the time. When you separate the metals in waste (for example an old car), you can get usable metal out ...

Ozone layer

Hi everyone, What even is ozone? And the ozone layer? Where does the hole in the ozone layer come from and what does it mean? Is it dangerous? What can be done? Often the ozone-talk can be complicated and confusing, keeping an overview is hard and understanding all the problems always difficult. Let us break it down a bit for you: What is the ozone layer? We'll start with the basics: The ozone layer is part of the stratosphere, which is the second layer of the Earth's atmosphere, between 10 and 50 km above the Earth's surface and made up of protective gases. One of these protective gases is ozone. There is not much ozone in the atmosphere, only 0.3 molecule of ozone per 1 million molecules of air. This is because ozone is chemically unstable and only forms when ultra violet radiation (UV light) hits oxygen and breaks the bonds between the atoms. It fact it is so unstable that even when it has formed, it breaks down again relatively quickly. This leads to ozone turning back ...

December Factfile

Hello, The fact file vote has come to an end and we have a winner. This year, we will be doing top tips. These will come out at the beginning of the month. These tips are, at the same time, challenges. We hope you will enjoy, and apply them! News Good news New hope for coral reefs A coral reef in India has been restored to health- the proof being in the noises the fish have been making. Many of these strange sounds have never been recorded before. This is amazing, especially considering that the reef has been devastated by blast fishing, where explosives are used to stun or kill everything in the area. Although the corals are being restored, scientists want to know if the animals are also returning and in what numbers. The Guardian states that 'Sound is vital for reef survival, because almost all of its inhabitants, from corals to crustaceans to fish, produce offspring that spend the early part of their lives in the open oceans, before us...

04.10.2020 Animal of The Week: Orca

Hello everyone. This week's animal of the week is Orca. They are also known as killer whales. Habitat Orcas live all over the world. They migrate according to where their prey are. However they are more common in colder waters. Diet Orcas are at the top of the food chain and have very diverse diets, eating mainly fish but also penguins, and marine mammals such as seals, and even other whales. They hunt (and live) in groups, making them very dangerous to certain species. Dangers There are a few dangers that they face, although for now the population doesn't seem to be suffereing. Some of these are: -Hunting for entertainment as they are intelligent creatures and so appeal to people who want to test their skills. -Polluted waters can be a threat as when certain chemicals get into the orca, most likely from their prey, they can be lethal. These can get into the water by oil leaks and chemical leeches. -Prey as overfish...

10 animals on the edge of extinction you didn't know about no. 6 - Brown spider monkey

Hello, Today we're looking at a subspecies of monkey called the brown spider monkey ( Ateles hybridus ). The brown spider monkey, also known as the variegated spider monkey, can be found in the Magdalena River basin in Colombia and Venezuela. They live in lowland (sub-)tropical forests. They are social animals, living in groups of up to 30 individuals. These groups have no known social heirachy and are territorial. They split up into smaller groups while foraging for food. Their diet consists of ripe fleshy fruit, flowers, roots, young leaves and seeds. They are vital for the survival of their eco system as they play an important role in seed dispersal. Adult individuals weigh 6.5 to 9 kg. The females are slightly heavier. They mostly have brown eyes although some have remarkably pale blue eyes. They are about 50 cm big and live for 10-27 years (in the wild). Brown spider monkeys have long legs and a long thin powerful tail. They are better...

Green World

Search This Blog

Evolution

Labels