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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.

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."

"d.) carbon dioxide and hydrogen sulfide"