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_____ is the maximum number of individuals of a species that an environment can sustain.

True or False:  The guard cells regulate the passage of carbon dioxide out of the cell and oxygen into the cell.

_____ is the movement of organic compounds through phloem.

_____ is a threatened region with great biodiversity that is considered a high priority for conservation efforts.

_____ is a thin layer where temperature falls rapidly in a lake.

In most ecosystems, the primary producers use energy from ______ to build organic compounds.

Which of the following groups has the most threatened species?

_____ is the embryonic root of a monocot.

Topsoil would be found in which soil horizon?

Which of the following are the building blocks of proteins