When a human embryo develops, it produces a special type of hemoglobin not found in infant, child, or adult blood. Which statement best explains how an embryo can produce a different type of hemoglobin from that of an infant, a child, or an adult?

A.) Humans have genes for different types of hemoglobin, and they are expressed at different times.

B.) Human genes change slowly as a person ages.

C.) An embryo and an adult have different genes for hemoglobin.

D.) As the embryo develops and cells differentiate, certain genes are lost.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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answer;

-vessels in the chest

the diagnosis of angina pectoris literally means "vessels in the chest"

explanation;

-angina pectoris is the medical term for chest pain or discomfort due to coronary heart disease.it is the chest pain due to an inadequate supply of oxygen to the heart muscle. the pain is typically severe and crushing, and it is characterized by a feeling of pressure and suffocation just behind the breastbone.

agina pectoris is caused by reduced blood flow to your heart muscle. the blood carries oxygen, which the heart muscle needs to survive. when the heart muscle isn't getting enough oxygen, it causes a condition called ischemia