What happens to new oceanic crust at a mid-ocean ridge
a. it forms new mountains under the water
b. it climbs up the mantle to form a trench
c. it gets hotter and sinks into a trench
d. it is so dense that gravity pulls it into a deep-ocean trench

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit

Which genetic disorders, caused by an extra x chromosome (xxy), is characterized by a lack of testicular development in males, effeminate features, possible mental impairment, and a thin stature?

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.