Why blood group o has not antigen on the surface of red blood cell?

What's the two methods that scientists can use to determine whether two species (modern or extinct) are closely related

Both chloroplasts and mitochondria are like in that they both have?

7) How many alleles will a gamete have for any one gene?

Write a paragraph to explain why the characteristics important to scientists lead to the development of scientific knowledge.

In the cycle rocks can change into three different forms these are

Which of the following correctly describes homeostasis in protists? (A) Paramecium maintain homeostasis by swelling and bursting (B) Vacuoles allow water to enter and exit the paramecium (C) Flagella allow paramecia to move through a substance (D)

List 4 observations that indicate that a chemical reaction may be taking place

Which statement describes the light reaction of photosynthesis? A. Water molecules are combined to make food. B. Air and water create energy for a plant. C. Carbon dioxide is put together with glucose. D. Water molecules are split apart.

4. Where are the two places we find receptor proteins? Inside the target cell, target cell plasma membrane Signaling cell plasma membrane, inside the target cell Signaling cell plasma membrane, ligand Target cell plasma membrane, signaling cell

What most directly causes hypertension? lack of blood flow to the heart a weakening of a blood vessel wall excessive force of blood pumping injury to heart muscle