The most successful reinforcement schedule to use after an animal has learned a new trick has been shown to be:

a) fixed-ratio

b) fixed interval

c) variable ratio

d) variable-interva

Karina is looking at a cell under the microscope. it is the only cell in the organism, which has a cell wall and no nucleus or membrane bound organelles. in which kingdom should this organism be classified?

Which of the following is NOT involved in the inflammatory response? A. Activation of B cells by cytokines from TH cells. B. Adhesins, which cause phagocytes to adhere to capillary walls. C. Secretion of IL-6, a pyrogen. D.

What is a good index fossil

Australopithecus is an ape that lived in trees but could walk on two feet. How might fossil from Australopithecus provide evidence for evolution

If an allele makes up one half of the frequency of a population's allele for a given trait, its allele frequency is

Which are processes that add to the genetic differences in siblings? Check all that apply. interphase independent assortment cytokinesis crossing over mitosis

Which of the following is a function of the cell membrane of a cell? A. The production of energy from food molecules using cellular respiration. B. The production of genetic material through DNA transcription. C.

Which process occurs only in autotrophic organisms?

Polymers are made of individual subunit called

What are the exergonic reactions that provide living systems with energy (give two examples) ?