You look at a sample of tissue under the microscope. You determine the sample is not from an animal because the cells in the tissue have

A. nuclei.

B. cell membranes.

C. cell walls.

D. membrane-bound organelles.

Maternal iron stores transferred to the fetus during the end stages of pregnancy generally run out by the time an infant is six months old. iron is important for cognitive development.

Which type of stem cell is described below? stem cells are available from a variety of sources, including blood from an umbilical cord, or cells in the placenta, the bone marrow, and even human fat.

What marine ecosystem has the fewest a valuable nutrients?

A boxer has been jumping rope for an hour his leg muscles are burning and he feels weak what substance is most likely cause of the burning he feels in his muscles

Non Examples of asexual and sexual reproduction

How many cell types are present in your groups set of organisms?

Which of the following is the functional unit of a myofibril? a. sarcomere b. myofilament c. sarcolemma d. endomysium

20. In certain species of summer squash, fruit color is determined by two interacting genes. A dominant allele, W, determines white color, and a recessive allele (w) allows the fruit to be colored.

When you look out the window, you can see constantly moving air. air is cycled in order to reach equilibrium. B) since these change the density of air and we know the air flows from the region of high density to the region of low density.

What effects do deforestation have on the animals?