The organic chemicals that cell membranes to conserve internal fluids are
a. hormones
b. phospholipids
c. amino acids
d. proteins

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste.the percentage of food that the united states wastes each year is %.

People with one sickle cell allele are not likely to get malaria. what is this an example of?

There are only about 250,000 known fossil species. true or false