The untreated sample group, or zero value group, or placebo group is called the o negative control
O independent variable
O positive control
standard variable
O experimental group

According to the theory of punctuated equilibrium, at what rate does speciation occur? species change depending on the rate of natural selection. after periods of stasis, new species evolve relatively rapidly. species change slowly and eventually form new species. some species change quickly and others change slowly to balance the overall rate.

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what