pinenut
This method is called quadrat sampling. It involves counting the number of organisms in a small defined area (quadrat), then multiplying that count to estimate the total number of organisms in a larger area based on the assumption that the distribution is homogeneous.
The number of individuals in the population is the population's size. If a population is small enough you will be able to determine the size by counting the individuals.
Small organisms that live in the sunlight regions of the ocean is called Plankton!
They were small stones or pebbles - called calculus (pl = calculi).
Microbiology
Nitrogen fixation. It can only be performed by a very small number of species of anaerobic bacteria.
Microscopic organisms are called microorganisms. Examples of microorganisms are bacteria, fungi, protists.
The small organisms that are the base of aquatic food chains are called plankton.
Proteins are the building blocks of all organisms.
Phytoplankton
They are called decomposers.
Answer: Tundra are deserts because the tundra supports only a small number of organisms, it has low precipitation (often only 10 to 12 cm [3-5 inches] per year). When you have very little precipitation and no wildlife it is considered a desert.