Abiotic factors are the non-living parts of the environment that can often have a major influence on living organisms. Abiotic factors include water, sunlight, oxygen, soil and temperature.
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Amoeba cells catch food and move about extending fingerlike projections of a colorless material called protoplasm and are found in decaying bottom vegetation of fresh water streams and ponds
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Polygenic inheritance refers to a situation where a single phenotype character is determined by the addictive of two or more genes.
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c. pituitary gland
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The hypo(below) thalamus is an almond size structure located superiorly to the brainstem. it is located below the thalamus. Hence the name hypothalamus.
It is primary function is is to control the body homeostatic functions of sleeping and waking up, sex, thirst and hunger etc.
It performs these roles by serving as the primary link of the nervous system with the endocrine system. Pituitary gland is an example of endocrine gland that secrets many hormones. (they are called endocrine because the hormones are secreted directly into the blood streams.
<u>Its activities are controlled by the nervous stimulation from hypothalamus. Therefore the instructions to secretes certain hormones to the post and anterior part of the pituitary gland depends on the hypothalamus.</u>
Growth hormones, oestrogen, and thyroid are examples of hormones of the pituitary glands.
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Organic molecules produced from spontaneous synthesis or from meteorites
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