What is the main reason water from the oceans turns to water vapor, and then evaporates into the air?
a) ocean breezes
b) changing tides
c) heat from the sun
d) moon's gravitational pull

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.

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?