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This picture represents an ecosystem or the reactions between living and non-living components in a specific area.

We can see a variety of living and non-living things. There are plants and animals, soil and water, air and light energy from the Sun.

Although they are too small to see with the nàked eye, there could be a range of microorganisms, such as bacteria, algae, fungi, protozoa, or even viruses.

The river and its banks are examples of a habitat, which is a place where an organism can live or grow. The deer, the racoon, the dragon fly and the eagle are examples of individuals, or single living thing. All the organisms of the same species, in the same place,at the same time represent a population. Some examples are the cattails, the fern, the ladybug and the turtles. These individuals organisms, of the same species, interact with each other to form a community.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg