Heterozygote individuals (who have one copy of the s allele) have some resistance to malaria, an insect-transmitted disease which can also be fatal. a. True
b. False

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

When wind creates a sand dune, the sheltered side of the dune is less steeply sloped than the windward side has the same incline as the windward side is more steeply sloped than the windward side