For a plant, carbon and nitrogen are ________.

Molluscs with a tubular shell and sheath foot are:

a. scaphopods. b. gastropods. c. bivalves. d. cephalopods. e. nudibranchs.

Deciduous trees are the dominant plant in which type of biome?

a. tropical forest b. temperate forest c. chaparral d. savanna

Vestigial organs

a. did not have a function when they first developed, but do so today. b. are similar in many organisms. c. must have evolved individually in different organisms. d. are not found in present-day organisms. e. include the human appendix and wisdom teeth and a snake's hipbones.

The ________ is the minimum energy required before two molecules can be successful in producing a reaction

Fill in the blank with correct word.