Which level of organization within the biosphere is made up of many different organisms that exist in the same environment as well as the nonliving things that they interact with?

The body is protected against harmful flu viruses by

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy