Answer:
1. cell type
2. their ability to make food
3. number of cells that make up their bodies
Explanation:
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B. Tooth Decay - because of the acid from your stomach rests on your teeth.
The heart rate is different while dancing, studying and riding a bike because the amount of blood needed for each activity is different. Blood pumps as fast as it as needed by the cells, which is why riding a bike has fast heart rate while studying has a regular heart rate.
Answer:
Experiments can show cause-effect relationships
Explanation:
Answer: Before about week 8 of pregnancy, a doctor may refer to the fetus as an embryo. The heart of an embryo starts to beat from around 5–6 weeks of pregnancy. Also, it may be possible to see the first visible sign of the embryo, known as the fetal pole, at this stage.
