In the open circulatory system found in arthropods and mollusks, the heart pumps blood into a blood vessel which branches and opens in an internal structure called Haemocoels.
The haemocoel is a highly functional part because it allows
- organs and tissues to be bathed in blood,
- for exchange of materials to occur between the body cells and the blood.
I chose B but I got it wrong. Since lizards obviously have dry skin, the other option with lizards is C. And you can also see in the cladogram that above "dry skin" is lizards and tigers.
you are using your shoulder muscle. The reason you are using this muscle is when you put your arm strait up there is no reason to use a bicep or tricep muscle.
