Which of these valves prevents a backflow of blood into the left atrium?

aortic valve

tricuspid valve

mitral valve

A key is a taxon. A. True B. False

There is a mutation in the repressor that result in a molecule known as super-repressor because it represses the lac operon permanently.

Which best describes a semidiurnal tide pattern? A) Two high tides and two low tides each day B) Two high tides and two low tides each month C) Two high tides and two low tides each season D) Two high tides and two low tides each year

How does fluid enter the lymphatic system? a. high blood pressure causes fluid to leak from the capillaries b. low blood pressure causes fluid to leak from the capillaries c. high blood pressure causes fluid to leak from veins in the neck d.

Which is the mostly likely cause of the observed variation?

How are traits inherited by offspring?

In homeotic mutants: Group of answer choices one body structure is missing. one body structure has been changed into another. one body structure has been duplicated. one body structure has significantly increased in size. the organism is infertile.

What effect of acid rain on a ecosystem is

What is a valid reason for making efforts to maintain the biodiversity of the planet earth? A Biodiversity makes ecosystems stronger, more stable, and more resiliant to environmental change.

Justin says that venus and jupiter are similar planets in our solar system. amanda argues that the two planets are actually very different from each other. who is correct? why is that person correct?