What is the difference between a cell, a tissue, an organ, and a system in an animals body

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

The structure that houses the cells genetic information.

Read the scenario below and answer the question that follows. hallie is reading a novel in the library when susan, her best friend, slumps down in a chair next to her. susan doesn't say anything, but hallie knows that susan is upset because she is slumping in her seat and rolling her eyes. a psychologist would explain that hallie is interpreting her friend's emotion based on a. the behavioral component of emotion b. her friend's ability to regulate emotion c. the verbal component of emotion d. the physiological component of emotion select the best answer from the choices provided a b c d