Some animals eat veggies some eat meat, some eat both. There is also the fact that the larger the animal is the more it has to eat to get the same nutrients. Like how the lower you are on the food chain the less you have to eat but the higher you get the more you have to eat.
The plasma membrane is a phospolipid bilayer.
The reason why we call it a phospholipid bilayer is because it's created exactly out of that - phosphobilipids :)
Phosphorous (chemical element) + bi (means two) + lipid (means fat)
The pumping of the heart is tied to the respiratory system
