The heart is an organ because it a. maintains homeostasis.
b. is made up of different kinds of tissues.
c. contains blood.
d. contains muscle.

d

Explanation:

Your heart is an organ that’s largely made up of muscle. It has the vital function of working to pump blood to the organs and tissues of your body.

b or d

Explanation:

Its b  or c I am not too sure. I think its d though.

it would be the percentage of food eaten by the flock

i remember doing this lab

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.