Why do we refer to it as a theory

What are the dependent variables of the pond experiment

Why do all organisms need nitrogen

Diffusion suppose molecules were unable to diffuse into and out of cell. how might life be different if cell had to use active transport to move every substance? explain your reasoning?

What is the most likely reason that a moon is spherically shaped?

Which structures are parts of the central nervous system? Select all that apply. the brain the heart the spinal cord the sensory neurons the bones the muscles

In which of these mitosis phases is the replication of dna accomplished?

An assemblage of local plants, animals, and insects covering a large area such as a tropical rainforest or a grassland is called a

When dust and ash particles block out sunlight and reduce solar radiation earth experiences the

Describe one piece of evidence that supports the idea that the present-day continents were once part of a larger continent, Pangaea, that split apart

The sympathetic division of the autonomic nervous system prepares the body for stressful situations that require energy expenditure, such as by increasing heartbeat and respiratory rate to flee from a threatening situation. A. True. B. False.