Obsidian's glassy texture indicates that it formed
a) slowly, deeply below earths surface
b) slowly, on earths surface
c) quickly, deep below earths surface
d) quickly, on earths surface

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. which punnett square represents the correct way to set up the cross rryy  ´  rryy? 

What contributes to the high level of biodiversity found in wetlands? a. the large amount of available organic matter to organisms that are food for larger organisms b. the amount of available water for organism use c. the high nutrient availability d. all of the above select the best answer from the choices provided a b c d