What limits the growth of phytoplankton? 1.the number of fish eating the phytoplankton
2.the amount of nutrients in the water
3.the depth of the ocean
4.the amount of water that runs off into the ocean

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

The term autotroph refers to an organism that: a. uses co2 for its carbon source. b. must obtain organic compounds for its carbon needs. c. gets energy from sunlight. d. gets energy by oxidizing chemical compounds. e. does not need a carbon source

Which of the items below would describe the genotype of an individual? a.blue eyes b.bb c.brown fur