The diagram to the right shows an HIV particle. What is the function of the glycoproteins on the outside of the virus?
A. to carry genetic material
B. to propel the virus forward
C. to help the virus invade cells
D. to protect the HIV particle from antibodies

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

Which of the following is an effect of the uneven heating of the earth by the sun? a sea breeze a land breeze a convection current all of the above

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim