The ring of muscles that guards the opening between the stomach and the duodenum is the

What type of fatty acid does butter contain

During muscle contraction, what happens

Why doesn't the cell membrane pinch in to divide the cytoplasm telophase in plant cells

These are groups of reproducing populations that are insulated from other groups

Which is worse? a mutation at the beginning of a gene or the end of a gene?

A male tree frog migrates to a new habitat with little ground vegetation and many tall trees. Jumping is the safest way for the frog to move from tree to tree.

Select the correct answer. Neurofibromatosis, a genetic disease caused by mutation on the NF1 gene, follows an autosomal dominant pattern of inheritance.

Which of the following is NOT a way a cell can increase its surface area A. decrease its volume B. add organelles C. let water out of the cell D. all of the above

Using a pH meter, you find that egg whites have a pH of nearly 8 and egg yolks have a pH near 6, if litmus paper turns blue in bases and red in acids, which part of eggs would turn litmus paper blue? A. both B. egg whites C. egg yolks D. neither

With all his gear neil armstrong weigh 360 pounds on earth when he landed on the moon he weighs 60 pounds why