Pl help asap The voyage of the H. M.S Challenger was important because

A. it was a race won by Americans, to demonstrate superior sailing and ship building skills

B. navigators were able to circumnavigate the globe for the first time in history, demonstrating celestial
navigation skills

C. physicists, chemists, and biologists conducted experiments and gathered collections that changed
exisisting scientific knowledge about the oceans.

D. the first known data gathered about ocean currents and the Gulf Streams influence on weather were
documented by biologists and meteorologists.

the answer to your question is b

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

correct answer is a. and d.