Most energy in an ecosystem originally comes from
plants
primary consumers
the sun
the soil

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.

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

If the nucleus of a cell was removed the cell wouldn’t be able to make proteins because