Answer:
a. heart development.
Explanation:
As the third week of fetal development starts, the process of formation of blood vessels begins. Also, the splanchnic mesoderm in the head end of the embryo forms heart on days 18 and 19. Since it develops heart, this part of the mesodermal cells is called the cardiogenic area. The underlying endoderm sends the induction signals to these mesodermal cells to form a pair of endocardial tubes that gradually develop into a single primitive heart tube.
This primitive heart begins to beat by the end of the third week of development. Therefore, any drug that affects fetal development during the first 20 days of the pregnancy might affect the development of the heart.
Answer:
The law of conservation of matter and energy states that matter is neither created nor destroyed but conserved. They can only rearrange the matter and energy. For example, an oxygen atom will cycle through a living system.
Answer: Change between generations
Explanation:
Heredity involves the passing of characteristics or traits from one generation to the next. It accounts for the reason as to why offspring look like their parents.
Answer:
Hi, There!
Denaturation Is the Correct Answer!
Explanation:
When an enzyme is denatured, it essentially melts and loses its shape. Denaturation can be caused by extreme heat and by changes in pH.
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