the vascular tissue in plants that conducts sugars and other metabolic products downward from the leaves.

a colorless, odorless unreactive gas that forms about 78 percent of the earth's atmosphere.

The chemical element that humans and animals need to breathe in order to survive.

Carbon Dioxide

an individual animal, plant, or single-celled life form

The process of consuming food for energy

a biological community of interacting organisms and their physical environment.

the surroundings or conditions in which a person, animal, or plant lives or operates

the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation as rain and snow, drainage in streams and rivers, and return to the atmosphere by evaporation and transpiration.

of, on, or relating to the earth.

a simplified drawing showing the appearance, structure, or workings of something; a schematic representation.

In the classical physics observed in everyday life, matter is any substance that has mass and takes up space by having volume.

A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain.

an instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude.

the system that circulates blood and lymph through the body, consisting of the heart, blood vessels, blood, lymph, and the lymphatic vessels and glands.

a biological system consisting of specific organs and structures used for gas exchange in animals and plants

the basic structural, functional, and biological unit of all known living organisms.

an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighboring region of planetesimals.

a type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity...it's on fire