Which best describes darwin’s studies that led to the theory of evolution?
a) extensive research of an individual organism within a short period
b) extensive research of an individual organism over many years
c) observations and data collected within a short period
d) observations and data collected over many years

In a lab, scientists grew several generations of offspring of a plant using the method shown. what conclusion can you make about the offspring? a. they formed from meiosis and mitosis. b. they have half the number of chromosomes as their parent. c. they have low genetic variability among them. d. they will be able to reproduce only after they grow flowers.