For the carbon cycle and the nitrogen cycle to function properly, which organisms must always be present?
a) decomposers
b) herbivores
c) parasites
d) predators

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

Which group is noted for the independence of gametophyte and sporophyte generations from each other? a) ferns b) mosses, hornworts, and liverworts c) charophytes d) angiosperms e) gymnosperms

Scientific evidence is most likely to be consistent if it is based on data from