What is used to measure the density of the earths layers

Consider four elements from Group 17: fluorine in the second period, chlorine in the third period, bromine in the fourth period, and iodine in the fifth period. Which element has the largest first ionization energy?

Name two findings that have emerged from experiments done in space iss

Lipids are A. soluble in water. B. made of chains of amino acids, C. Linked together with peptide bonds. D. used by the body for storing energy.

This climate zone is most likely to have distinct seasons that range from hot to cold

Genetic drift refers to changes in the gene pool of a population that result from O A. injuries caused by male competition O B. changes in the number of polygenic traits O c. a type of artificial selection D. random changes in allele frequencies

What is the complementary base of adenine in DNA? guanine cytosine thymine uracil

Fish in a marine environment must maintain a relatively constant ion concentration in their tissues and blood. How do the chloride cells in the gills aid fish in the removal of excess ions? A.

Name three groups of plastic sedimentary rocks

A section of DNA that carries enough information to make a single protein is called a (an) A. codon. B. enzyme. C. gene. D. intron.

During the winter months, water on the surface of a pond will typically freeze and this ice acts as an insulator for the water beneath it. As a result, aquatic life is able to survive during the cold winter.