The tiny hollow air sacs in the lungs where gas exchange takes place are the?

The addition of an amino acid to its correct t-RNA is said to involve the 'second genetic code' What is meant by this?

Why is it crucial to be aware of and respect the environment?

All BUT one procedure is appropriate use of a compound light microscope. That is

It is thought that cause past Ice Age climate

Which evolutionary mechansim caused the increased

Mark is studying jellyfish in a small body of water. Mollusks are a primary food source for jellyfish, and a large number of mollusks have recently been harvested from the area. How will this impact the carrying capacity for the jellyfish?

Summary of newton's laws and their importance to daily lives

Explain what is meant by the statement cleaner than coal

What type of cells are produced after fertilization occurs and the gametes combine? A) an egg cell B) a sperm cell C) a diploid zygote D) a haploid zygote

On a hot summer day, you notice a line of dark clouds forming. based on this observation, you go back inside and get an umbrella. what scientific skill have you used.