Requirements to receive USDA certification for organic agriculture include which of the following?
1. Only diseased animals are allowed antibiotics.
II. All animals must have enough space to behave naturally.
III. No animals can be exposed to artificial hormones or pesticides.

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass

Which describes a grizzly bear’s habitat?