Which of the following is a potential obstacle to the commercial development of brownfields? a. the presence of pollutants b. environmental cleanup laws c. the costs of environmental cleanup d. all of the above

In a cross of two heterozygous parents, 25% of the offspring should have the recessive phenotype. True False

A particular environment has enough food to support 50 rats through the winter. At the end of winter one year, there are 25 female rats and 25 male rats. Each of the 25 females gives birth to several litters of 3-6 pups each.

What elements make up lipids?

What are the subunits of insulin

What can affect the activity of an enzyme?

What is the importance of decomposers in an ecosysyem such as mold?

Which statement about ddt best shows how science has been impacted by society? ddt led to insect resistance. ddt was considered harmful and was replaced by other pesticides. ddt was the first modern insecticide.

What factors affect the diffusion of water through a membrane by osmosis?

What chemical structure makes up the cell membrane? protein bilayer hydrophilic phosphate phospholipid bilayer hydrophobic fatty acid

Which of the following statements accurately describes the process of dating Earth's history?