Halo, any of a wide range of atmospheric optical phenomena
The stage that scientists begin to ask questions and attempt to explain observations is A. forming hypotheses. This is because a hypothesis is basically a testable question about observations scientists make.
I'm pretty sure that it's C. I'm not quite sure though.
answer is D
antelopes with muscular legs are able to outrun their predators better than antelopes with poor muscle tone. they lived to reproduce .
Memory B cells are produced
