What natural disaster buried an entire town in ash?
a. the volcanic eruptions of mt. vesuvius
b. the galveston hurricane
c. the san francisco earthquake
d. the japanese tsunami

Ascientist and her team counted 200 individual deer in an area of 10 square kilometers. what is the population density?

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

Ihave made a synthetic cell by placing a solution that is 10% sodium chloride inside a semipermeable membrane through which water can pass but not sodium chloride. if i place this cell into a solution that is 20% sodium chloride what will happen to the size of the cell? will it increase, decrease, or stay the same in size?