What substance combines with oxygen in cellular respiration?
a) fat
b) sugar
c) water
d) carbon dioxide

Scientists discover two populations of mice on either side of a major river. the two populations have almost identical genes but the mice from one side cannot breed with mice from the other. this is most likely because

Discuss cell surface transport in the structure of constituents

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.