Which of the following are factors which shape marine ecosystems?
a) salinity of the water
b) temperature of the water
c) the amount of oxygen dissolved in the water
d) all of these

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

Mitosis creates two identical daughter cells from one parent cell creates four nonidentical daughter cells from one parent cell is the most common type of reproduction for bacteria is the process by which male and female reproductive cells are created

Why are some places regularly warmer or cooler than others in a given month