Answer:
Enzymes help speed up chemical reactions in the human body. They bind to molecules and alter them in specific ways. They are essential for respiration, digesting food, muscle and nerve function, among thousands of other roles.
Explanation:
The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old.
Answer:
In a comparison of birds and mammals, the condition of having four limbs is a shared ancestral character
I can't answer 1 but 2=First, make sure you weather proof the house, than go from there and try anything you think is necessary in this situation.