Almost any chemical can be harmful if

a. it is present in the environment

b. a person is exposed to it repeatedly

c. it's ingested in large amounts

d. a person has never been exposed to it before

Fossils can only be formed when? if mud, silt or tar is in the area to preserve the fossil ierosion does not occur and allows the fossil to form oxygen and microorganisms cannot decay the bones the area is dry and does not contain mud or silt

Approximately what portion of the foods that we eat have been genetically modified in some way? a.fewer than 10% b.about 50% c.nearly 100%

The arrows indicate the direction of wind flow. which place experiences monsoons?