Answer:
placenta
Explanation:
Nutrients and waste products are exchanged between the mother and her baby through the placenta and umbilical cord without any mixing of their blood.
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Answer:
Bend your knees
Explanation:
bending knees causes more speed and a better position for bones.
Answer:
When groups of tissues work together, they are called organs. Some examples of organs are the heart, lungs, skin, and stomach. When organs work together, they are called systems. For example, your heart, lungs, blood, and blood vessels work together. They make up the circulatory system.
Explanation:
Answer:
D. They occur where two or more bones join.
<em>This is the correct option :)</em>