D) one direction
HEART VALVES OPEN TO MOVE BLOOD ONLY IN ONE DIERECTION WHICH IS FORWARD DIRECTION BLOOD NEVER FLOW BACKWARD INSIDE HEART.
1.The nucleus of a cell allows it to perform its activities
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2.The cytoplasm of a cell includes organelles, which are structures that perform the functions the cell needs to live.
3.Cells are the functional units of living organisms.
4.The amount of material a cell needs to function is determined by its nucleus.
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Answer:
gene mutation
Explanation:
due to failure of break down of certain amino acid which are inherited in the gene
1-centrosome
2-spindle fibers
9-chromosome
10-nucleus(nuclear membrane)
Ok i will answer yo question but what does infant mean