3 Which phrase best describes a bird's skeleton? A Light and flimsy
B Heavy and flimsy
C Heavy and strong
D Light and strong

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

How many major plates cover the earth

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.