There are trillions of cells within the human body, many of which are specilalized to perform specific functions. Red blood cells contain no nucleus or other organelles so allowing room for the oxygen carrying haemoglobin, smooth muscle cells are elongated and can shorten to allow for muscle contraction. Within all cells (except the RBCs) are organelles such as the nucleus and mitochondrion, and these organelles perform functions that are essential to life.
Answer:
The epidemic caused us to quarantine if we got infected to protect those around us.
Explanation:
A specific organ on which a hormone, drug, or other substance acts
Answer:
Maybe B, I need more evidence
Explanation:
