The specialization in the structure and function of cells that occurs during the development of an

organism, results from selective activation and deactivation of the cell's genes.

Sound travels as mechanical waves. How does light travel? as mechanical waves as magnetic beams in a medium as surface waves as electromagnetic waves

Action potentials are all-or-none phenomena. This means that ... Group of answer choices a) they must fire a certain number of times a second to communicate information accurately. b) they require a certain amount of stimulus to fire.

A body part that is reduced in size and no longer has a useful function in an organism is called an

Which of the following is not a characteristic of rivers and streams? a. vary in size b. mainly saltwater c. part of the water cycle d. flow toward other bodies of water

Black widow spiders are considered the most venomous spiders in North America. They are roughly 1.5 inches long. Black widows have a life cycle of one to three years.

Which substance is a natural land resource used in construction? steel bedrock clay salt

Which three elements do all four biomolecules have in common

What is the most likely reason why volcanologists often rely on model to study volcanic eruptions

What is a biome and what is the difference between a desert, forest, and grassland biome?

Describe how you get energy indirectly from the food that you eat