If limestone is exposed to the correct amount of heat and pressure what can it become
a) shale
b) sandstone
c) marble
d) clay

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

Speed is the ratio of the distance of an object moves to

As a result of climate change earths temperature is rising and sea ice is melting what is a likely effect? answer : populations of walruses and polar bears will decline