Some features might be feathers, thin bones, they are lighter to make flying easier.
Specialized proteins in the cell membrane regulate the concentration of specific molecules inside the cell. ... Transporters carry a molecule (such as glucose) from one side of the plasma membrane to the other. Receptors can bind an extracellular molecule (triangle), and this activates an intracellular process.
Answer:
mutation or possible disease
Answer: the area occupied by a population
Explanation:
A population density can be define as the number of individuals of the population of a species living in per unit area over a particular time. Population density may vary depending upon the number of live births, deaths, number of immigrated and migrated members counted in concerned period of time.
