Do convection currents exist in Earth's crust?

yes convection currents occur in earth's crust I hope this helps

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it