Prokaryotic cells lack a defined nucleus, but have a region in the cell, termed the nucleoid, in which a single chromosomal, circular, double-stranded DNA molecule is located.
To be an agronomist, you should have an interest in science and a bachelor's degree. In college take agriculture, biology, chemistry, mathematics, physics, and statistics courses, as well as broad based general education courses, including English and speech. Hope this helps your question.
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A biome is a group of ecosystems with the same climate
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Water diffusion is called osmosis. Oxygen is a small molecule and it's nonpolar, so it easily passes through a cell membrane. Carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. Small uncharged lipid molecules can pass through the lipid innards of the membrane.
