Which day of the year has the shortest period of daylight in the Northern Hemisphere?

A.

the spring equinox

B.

the summer solstice

C.

the fall equinox

D.

the winter solstice

During meiosis some of the genes inherited from your mother get swapped onto the strand of DNA you inherited from your father, and vice versa. This event is called crossing over.

How is nitrogen from the atmosphere, the abiotic part of the ecosystem, converted into the biotic part of the ecosystem in organisms?

David was in a car accident and needed a blood transfusion due to his injuries. his brother, steve, went to the hospital hoping to donate blood to be used in the transfusion. david's blood type is type b. steve's blood type is type ab.

The cells in your body need nutrients and other materials to stay alive. To be used by your cells, the materials must be a. slightly acidic b. eukaryotic c. dissolved in fluid d. transgenic

What is the function of a mitochondria? A) to capture light to make food. B) to break down sugar to produce energy. C) to store water. D) to excrete waste from the cell.

What happens to the total charge of the compound after the ions bond together?

How many atoms lined up side by side would equal the thickness of a book page?

If an ambulance hits someone on the road while transporting someone to a hospital, do they bring that person with them too?

Cell biologists have introduced radioactively labeled carbohydrates, fats, and amino acids to living cells, allowed time for cell metabolism, and then placed the cells in a blender and separated out the various cell organelles from the cytoplasm.

Increased production of goods makes our lives more comfortable, but causes an increase in the demand for energy and other resources. One negative impact of this situation on ecosystems is an increase in