A campfire is a good source of heat and light on a cool night. The energy that is released when firewood is burned comes from
A.
the kinetic energy of the moving flames.
B.
the energy used to carry the wood.
C.
the chemical bonds in the wood.
D.
the energy used to strike the match.

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.