14. What is a trophic level?
A) a living organism's position in the flow of energy through an ecosystem
B) the total amount of energy that is present in an ecosystem
C) an organism's environment, as well as physical factors that make up that environment
D) a group of organisms that can convert one form of energy into another form

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

2. cheryl hears a new song on the radio every day during the week on her commute to work. surprisingly, when the song comes on at a party on saturday night, she knows most of the words without trying. describe the three ways that we use cognition to learn without reinforcement. which type of cognitive learning without reinforcement best explains how cheryl knew the song lyrics? explain your answer.