Answer:
meiosis
Explanation:
The crossing over of homologous chromosomes occurs in meiosis. Meiosis is characterized by the lining up of homologous chromosomes close together to form a structure known as a tetrad.
Answer: Energy is passed up a food chain or web from lower to higher trophic levels. ... This loss of energy explains why there are rarely more than four trophic levels in a food chain or web.
Explanation:
Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.
Answer:If the cell grows too large, it will have trouble moving enough nutrients and wastes across the cell membrane. Cell Division. Cell division is the process by which cellular material is divided between two new daughter cells.
Explanation:
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Answer:
the smallest combination of four bases that could encode all 20 amino acids would be a triplet code. However, a triplet code produces 64 (43 = 64) possible combinations, or codons