Which one of the following criteria is necessary for natural selection to occur? a. individuals have the same adaptations. b. individuals show no variation in fitness levels. c. a struggle for existence is apparent. d. enough resources exist for individuals to survive and thrive

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 organelle stores most of a cell’s dna?

Which of these internal feedback reactions does not need your brain? oa. your leg jumping when it is hit by a reflex hammer b. your deeper breathing when you need more oxygen c. your body temperature rising when you have an infection d. your heart beating faster when you are in danger