Six fundamental elements found in all living things

What is the next step in muscle contraction after the actin changes shape? (apex)

The transport tubes for food coming down the plants are called?

Hydrogen has only one electron in its only (and outer) electron shell. if a hydrogen atom were to absorb a small amount of energy, where would bohr say the electron would go? a. fly off the atom b. nowhere, it would just speed up. c. spiral inwards towards the nucleus d. move up to another shell that would form