Answer:
1-A ring-shaped muscle that relaxes or tightens to open or close a passage or opening in the body.
2-Sphincters are specialized muscles that are located at the upper esophagus (upper esophageal sphincter (UES) and the gastroesophageal junction
Explanation:
True
One chemical reaction is the cellular respiration process, the other is photosynthesis.
Cellular respiration involves a series of chemical reactions. The enzymes increase the rate of the reactions. <span>The reactions that are catalysed by enzymes actually helps the organism to grow, respond to various changes in the environment, reproduce and continue maintaining their own structures. </span>
Answer:
100%
Explanation:
the only possibilities from HH and hh are: Hh Hh Hh Hh
Hello there.
<span>Regulation of the cell cycle is dependent upon cyclins and cyclin-dependent kinases. The key(s) that allows a cell to progress beyond the restriction point is (are)
</span><span>c. cyclin A and Cdk2.
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