Explain how the isotopes of an element differ.
they each have a different number of electrons in their outermost energy level.
they each have a different number of protons in their nuclei.
they each have a different number of neutrons in their nuclei.
they each have a different charge.

In a vegetable garden 45 bean plants have been eaten by deer 5 are untouched what is the frequency of bean plants in the garden that have been eaten?

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.