Answer: (SL) Semilunar Valves
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Answer:
Other deposits may be from fossilized bone or bird droppings called guano. Weathering and erosion of rocks gradually releases phosphorus as phosphate ions which are soluble in water. Much of the phosphate eventually is washed into the water from erosion and leaching.
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Answer:
active transport require energy to move molecule across a cell.
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Answer: energy produced in the core travels through out the gases of Sun and takes about million years to reach its surface
Explanation:
Functions of cell surface Receptors .
most ligands responsible for cell-cell signaling ( including neurotransmitters, peptide, hormones, and growth factors) bind to receptors on the surface of their target cells.
