Which of these is an environmental cost of tar sands extraction? a. acid rain b. earthquakes c. habitat loss d. oil spills

Where can you find prokaryotic and eukaryotic cells?

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 macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes