Which are characteristics of fish? check all that apply.
endotherm
ectotherm
invertebrate
vertebrate
open circulatory system
closed circulatory system

True or false: (a) the strings of little red dots represent carbohydrates. (b) the model is called a bilayer because there are two main types of molecules present, lipids and proteins. (c) the many black lines represent amino acid tails. (d) this model shows membrane transport. (e) the blue ovals are hydrophobic. (f) the blue ovals represent phospholipid heads.