The Search For Genetic Material

Inverted biomass pyramids occur in aquatic ecosystems because the biomass of primary producers (phytoplankton) is smaller but reproduces rapidly, supporting higher trophic levels. The reason provided is true, but it is not the correct explanation for inverted biomass pyramids. Energy typically decreases with increasing trophic levels, but rapid reproduction of primary producers compensates for their low biomass.

The placenta performs the following functions: Facilitates exchange of nutrients, gases, and waste products between the mother and fetus. Produces hormones such as hCG, progesterone, and estrogens to maintain pregnancy. Acts as a barrier to certain harmful substances while allowing essential nutrients to pass through.