Why is it important that cell membranes are selectively permeable?

What part of a neuron conducts electrical signals away from the cell body?

Frogs reproduce sexually. why do frogs require water to reproduce?

What makes up the majority of plant matter?

A solution that contains equal number of hydrogen and hydroxyl ions would be called

What is organic chemical energy changed into?

Which layer of the atmosphere does all weather take place?

A salt is added to a solution of water. Which physical property of the water is most likely to change?

When the moon is between the Earth and Sun it cannot be seen and is called a ___ moon.

Proteins attract water and hold it within blood vessels, preventing it from freely flowing into the spaces between the cells. this is an example of how protein is used for: a. maintaining fluid and electrolyte balance. b. building antibodies. c.

Identify the fuel that could be classified as a nonrenewable or renewable resource. A) biomass B) geothermal C) wind D) tidal