Which situation is a result of human activities?

a. decay of leaves in a forest adds to soil fertility

b. factory smoke causing acid rain in an area which kills fish in a lake

c. ecological succession following volcanic activity reestablishes an ecosystem

d. natural selection on island changes gene frequencies

Rotenone is an insecticide that is toxic

Recombinant dna (rdna) creates offspring which are genetically identical to the parent is the process of breeding only organisms with desirable traits involves the removal of the nucleus of a cell combines genes from organisms of different species in a lab

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