Zebrafish

Eh Htoo - we are learning about zebrafish. They are transparent and live in India's Freshwater lakes or rivers. Scientists study them because they are transparent and reproduce fast, scientists breed hundreds and thousands of zebrafish to study them.Then Scientists kill the fish in chemicals and cut it up. If they cut it in different shapes like coronal, cutting in half vertically, separating the front and the back, transverse cutting in half horizontally, cutting the head off the body Sagittal cutting in half vertically, cutting the left side away from the right side. When they cut it it will show different parts.Scientists kill way too much of the zebrafish.







These fishes are a year old and and they are cut Transverse you can see a lot of meat.

ZEBRA_FISH

 

Zebrafish - Wednesday

 

How animals evolved from water to live on land

 How animals evolved from water to live on land

EH HTOO

The first organisms to venture onto land (apart from plants) was around 30 million years Ago. A fish called coelacanth was one of the first to venture onto land - into a shallow marine environment. Scientists think it was either looking for food, avoiding predators or laying eggs in the shallow waters. It had to develop a stronger rib cage in order to support its body weight out of water (as in water all things are more buoyant). Over time, they also evolved lungs so they could breathe, and their fins became more boney and became strong legs which helped them move.  Years after the first amphibian like animals came along the first one had fins and years after it had half fins and legs after a lot more years it has all legs.

Early fish started to go close to land then after a long time the fish. Involved to go on land for a short time their limbs got stronger then the fish involved  to have lunges then the first amphibian like animals come about after years of evolution it was the rain of the.    

•  First had to evolve stronger rib cage, shoulders and limbs to hold up its own body weight

How do animals evolve from being in water to on land

 Life first emerged in the oceans nearly three and a half billion years ago when they got more complexed they started to swim close to land years later they started to go on land for shorts times after a long time they involved to have lungs and stayed on land for longer but there still went back in the water to cool off but they can not breath in the water anymore. When it got dryer the Reptiles ruled the world so some Reptiles did not go in the water anymore.   

Timeline of evolution

 

Adaptations