A Pollen Cell is called a Generative Cell
B.
Humans are also part of ecosystems and if they cease to exist, human well being will be affected.
Carolus Linnaeus recognized the vital role of the internal environment and suggested that objective of mechanisms within the body is to preserve the constant conditions of the internal environment.
He was later known as the creator of current modern system of naming animals called binomial nomenclature
hope this helps
