How does global air circulation and ocean currents lead to the formation of forests, grasslands and deserts that make up the earth’s terrestrial biomes.

answer; i believe the correct answer to the above question is ( friction)

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

they dont have any evidence

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.