Decomposers play no role in energy flow through ecosystems.

A population is defined as a group of individuals of the same species living in the same area at the same time.

Carrying capacity (K) represents the maximum population size that a particular environment can support.

Biogeography helps explain

A keystone species has a disproportionately large effect on its environment relative to its abundance.

Homologous structures in different species suggest

Natural selection always leads to an increase in the complexity of organisms.

Succession refers to the predictable change in species composition over time in an ecosystem.

Which mechanism of evolution can introduce new genetic variation into a population?

The phrenic nerve which innervates our diaphragm muscle arises from what area of the spinal column