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

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. the following chemical equation shows the combustion of ethane. balance the equation by filling in the coefficients. c2h6 + o2 → co2 + h2o

Facilitates growth and change in neurons and the migration of neurons to different sites in the brain

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone