Which of the following statements about good experiments is TRUE? a) A good experiment must include all possible causal factors in one experimental group.
b) A good experiment must have an experimental group. A control group may be useful but is not critical.
c) A good experiment should include a potentially confounding factor in at least one group.
d) A good experiment includes replication by applying treatments to multiple experimental units

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.