Which trophic level contains the organisms that are source of all chemical energy used in an ecosystem

What diseases is cause by cigarette smoke

The American College of Sports Medicine's recommendations for physical activity include a minimum of A) 75 minutes of vigorus intensity exercise a week B) 75 minutes of moderate intensity exercise a week C) 100 minutes of moderate intensity exercise

How do nerve signals pass through a synapse? by depolarization by acetylcholine by chemical transmitters by axon connections

Hakeem is testing the effects of sunlight on samples of soil. Which of these actions would introduce confounding variables into Hakeem's experiment? He tests a theory that's already been established. He tests multiple hypotheses at a time.

Which of these processes is a nearly universal energy-releasing metabolic process that indicates common ancestry for all life on earth?

Based on family pedigree studies, which relative of an individual with a diagnosis of schizophrenia would be most at risk for developing the disorder?

Which tools do meteorologists use to collect data about the weather? Check all that apply. satellites weather fronts maps and charts weather balloons automated weather stations

Describe how you would determine if the cells of a newly discovered organism were prokaryotic or eukaryotic

For what purpose does a cell use the energy from redox reactions in cellular respiration?

Why is a "ring if life " more appropriate to describe the relationship between archaea, bacteria, and eukaryotes than a "tree of life "?