Once a true cell was formed biological evolution began. biological evolution is all the changes that have occurred in living things since the beginning of life due to differential reproductive success. this means that

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

Lucia is walking barefoot in her yard. she accidentally steps on a nail. how will her nervous system work to generate a reaction? arrange the eventschronologically.