The yolk sac functions to form blood cells in early development. provide nutrients to the fetus when the umbilical cord is disconnected. store metabolic wastes until the fetus is born. give rise to the primary germ layers.

Light is a form of electromagnetic radiation that travels in waves electromagnetic radiation that does not move sound energy that travels in waves sound energy that does not move

Whitch of the following would cause an increase in competition in a forest ecosystem? Increase in the number of plants Decrease in the number of plants Decrease in the number of bears Increase in the amount of sunlight

1. Normal cells and cancer cells differ in several ways. This illustration shows some examples of visible changes in cancer cells. Multinucleated Which of these accurately describes a difference between cancer cells and normal cells? O A.

Which of the following describes tight junctions? a. junctions among epithelial cells lining the digestive tract b. junctions within electrically excitable tissues, such as the heart and smooth muscle cell c.

Pasteur's work shows us that theories A) can be disproved by peer review. B) must be modified as time goes by. C) can be modified with new empirical data. D) are never changed regardless of empirical evidence.

Tulang rusuk yang bersambung dengan tulang punggung tetapi tidak berhubungan sama sekali dengan tulang dada

Animals can undergo lactic acid fermentation. A) true B) false

1 What is the structure enters and leaves that regulates what the cell?

Sharks and their relatives are the first group of animals with jaws. why are jaws a significant evoluntionary development

True (bubble A) or False (bubble B) : Mutations caused by UV light will favor mutations that cause changes to protect the cell from UV light