When an insect is feeding on a plant, which types of tissue are at work to protect the plant and help it heal from injury?

Compare the composition of the moon's surface with the composition of the earth's surface.

How does food concentration affect yeast activity

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled