according to darwin, why do modern giraffes have long necks?
a
giraffes have always had long necks like the modern ones.

b
earlier short-necked giraffes stretched their necks over a long period of time.

c
ancient giraffes developed short necks and pass this trait to their offspring.

d
giraffes born with longer necks would survive better in an environment with tall tr

The fish shown above is a tarpon. it is a fast-swimming and powerful open-water fish. its closest relatives, oddly, are burrow-dwelling conger eels that stay on the bottom. both eels and tarpon developed from snake-like larvae that float in the plankton during the first stages of life. once they mature, tarpon and eels are not found near one another in the ocean. the tarpon and the eel illustrate all of the following except

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit