How a psychologist would explain purely practical from that particular perspective

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?

The direct energy source that drives atp synthesis during respiratory oxidative phosphorylation is