Answer:
A limiting factor is anything that constrains a population's size and slows or stops it from growing. Some examples of limiting factors are biotic, like food, mates, and competition with other organisms for resources.
I would have to say skin or hair
Answer:
Both A and B
Explanation:
Because RNA is single stranded and the DNA has a helix shape
It takes about one minute for a blood cell to make a complete circuit of the human body.
Answer:
A
Explanation:
An isolated system can NOT exchange energy or matter with it's surroundings. This is why it is isolated.