Which animal listed below would complete this food chain? carrot ⇒ rabbit ⇒
A. gopher
B. owl
C. sparrow
D. deer

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Which of the following describes the difference in stimuli required to detect a difference between the stimuli? a. just noticeableb. signal detectionc. subliminald. top down

Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine