Choose all the answers that apply. Constellations:
look the same all over Earth
O are patterns of stars
O usually include planets
o change with the seasons
are always in the same place

answer; polycythemia is the correct answer;

b. the carbon cycle ensures living things have a source of hydrogen

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

b is the answer and if you need further with anything message me