Which statement about lethal genes is most accurate? a) they cannot be maintained in a gene pool because the individuals do not survive. b) they cannot be maintained in a gene pool because they are always dominant. c) they can be maintained in a gene pool by heterozygous carriers when the allele is recessive and the individuals reproduce. d) they can be maintained in a gene pool if the allele is expressed before reproductive age.

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

What best describes the structure of the declaration of independence?