Trace fossils are recognized as evidence of what pre-existing life?

(a) plants

(b)plants and animals

(c)animals

(d) neither plants nor animals

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen

Select all that apply genes are specific nucleotide sequences occur in numbers that are the same as the number of chromosomes are located in a specific place on a chromosome determine the traits of an organism are units of rna