Answer:
Hypotheses about the origins of life
1. DNA strands separate
2. RNA polymerase attached to the gene
3.ribonucletides are assembled
4. mRNA searches from the gene
5. mRNA leaves the nucleus
6. mRNA attaches to ribosome
Insects, and some other invertebrates, exchange oxygen and carbon dioxide between their tissues and the air by a system of air-filled tubes called tracheae. Tracheae open to the outside through small holes called spiracles.
The answer is (b). I think
Diffusion. Diffusion is the movement of substances from an area of high concentration to a low concentration until the molecules are equally concentrated. It is a passive process.
