Which statement describes one feature of a mineral's definite chemical composition? It always occurs in pure form.
O It always contains certain elements.
It cannot form from living or once-living materials.
It cannot contain atoms from more than one element.
D

Which of the following are causes of coastal erosion? check all that apply. beach grasses and other plants trap windblown sand. wave action carves away the coastline. groundwater under pressure is forced to earth’s surface. artificial structures stop the natural flow of sand along the coast. underground caves collapse as bedrock is dissolved.

How does the molecular clock work? a. it analyzes the brain functionality of two different species. b. it examines and compares the physical characteristics of two different species. c. it illustrates relationships between two different species. d. it compares the number of mutations that exist in the dna of two different species.

Is there any solid scientific evidence that humans have been cloned?