They cannot hibernate in winter
<span>An environmental factor that causes a population to decrease is death</span>
<span>The correct answer is a.
Exocrine glands secrete substances through a duct; endocrine glands release substances into the blood.</span>
For example, exocrine glands are sweat, salivary, mammary, lacrimal glands… Endocrine glands excrete hormones. Examples of this type of glands are the pineal gland, pituitary gland, thyroid gland, parathyroid gland, pancreas, ovaries, testes, hypothalamus and adrenal glands.
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The difference between a multicellular organism and a colonial organism is that individual one-celled organisms from a colony can, if separated, survive on their own. so yes colonial organisms can live on their own.
The troposphere is the atmospheric layer closest to the planet and contains the largest percentage (around 80%) of the mass of the total atmosphere.