Biology, 22.07.2019 14:30 jaretktm2449
The phloem tissue of vascular plants is primarily composed of sieve elements and companion cells. these components allow the tissue to function in a very specialized way. sieve elements are arranged in long, cylindrical patterns that form a tube of cells. the cell membranes of these sieve elements allow molecules to pass between the cells of the tube. companion cells are responsible for taking up certain molecules made in the plant's leaves through active transport and moving them into the tubes made by sieve elements. based on the composition of phloem tissue, it is most likely used by the plant for
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The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons
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Biology, 22.06.2019 14:30
The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping
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The phloem tissue of vascular plants is primarily composed of sieve elements and companion cells. th...
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