Please help! How does the circulatory system work at the tissue level? A) The heart pumps the blood.

B (Blood cells carry nutrients.

C) Nutrients are delivered throughout the body.

D) Cardiac muscle contracts.

B

Explanation:

The circulatory system is a network consisting of blood, blood vessels, and the heart. This network supplies tissues in the body with oxygen and other nutrients, transports hormones, and removes unnecessary waste products.

The circulatory system work at tissue level by following points

=nutrients are delivered throughout the body

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ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'