What is productivity and what is the difference between net and gross productivity

Productivity is refers to the rate of generation of biomass in an ecosystem. The difference between net and gross productivity is that gross productivity is    is the overall rate of energy capture while net productivity is  is lower, adjusted for energy used by organisms in respiration/metabolism.

Explanation:

answer; i believe the correct answer is (anemia);

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.