Some diseases require only one vaccination that lasts forever. others require repeated vaccinations. why might a vaccination like the flu vaccine only last a short time? a. the virus is more easily transmitted. b. the virus mutates much more rapidly. c. the virus is less dangerous. d. the virus is much smaller.

One of the largest seafood exporters to the united states is a. china b. brazil c. mexico d. saudi arabia

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent

Types of scientific inquiry that biologist engage in that cannot be completely controlled