Emily's crops are dying; she noticed the ground has white spots on it and is cracked. What could be the cause?

a. Acid rain on soil
b. Salinization
c. Waterlogged soil
d. Desertification

Which best summarizes the finding of avery? a. some traits are recessive. b. humans reproduce sexually. c. dna is a transforming factor. d. traits cannot be inherited.

What adaptation is apparent in the bodies of the three tortoise species shown in figure 16-2

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them