Unlike identical twins, fraternal twins

A. are always the same sex

B. are produced from two identical embryos

C. result from two eggs fertilized by two different sperms.

D. is wrong

Which layer do you usually see in photographs of the sun

Which nonmetals, besides hydrogen, are most often involved in hydrogen bonding?

Ay increase by more than 170% to meet the body's increased o2 demands. this increase in cardiac output increases blood pressure. but the accompanying increase in arterial pressure is relatively small-only about 40%.

How are individual atoms of oxygen formed in the stratosphere? a. Individual oxygen atoms are formed when oxygen molecules collide with each other. b. Individual oxygen atoms are formed in the sun. c.

How the ozone layer contributed to the devolpment of eukaryotic ells

What algae is golden brown and one of the most common of all the unicellular organism in the ocean?

What is the name of the enzyme that adds new nucleotides to build mrna

If two people want to know the chances of their child have a certain genetic disorder, the parents must know their

Which of the following constitutes the primary structure of a protein? A. The folding of a polypeptide chain B. The linear sequence of amino acids in a polypeptide chair C. The polypeptide chains stacked on top of each other D. A pleated sheet E.

Most food chains have no more than six organisms. why is there a limit to the number of links in a food chain? a. animals at the end of the food chain would have too much food available. b.