Why do children in comparison with adults represent a group that is especially vulnerable to environmental hazards? choose the incorrect answer. a. they may be exposed more often to toxins in the outdoor air. b. they spend more time indoors. c. they may be exposed more often to toxins in the soil. d. they may inadvertently ingest toxic substances e. their immune systems are still developing?

Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.

Describe the change in phase and temperature as water moves from the oceans to the atmosphere and then returns to earth again as rain. a) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature decreases b) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature increases c) evaporation : temperature decreases; condensation : temperature decreases; precipitation (rain) : temperature decreases d) evaporation : temperature increases; condensation : temperature increases; precipitation (rain) : temperature decreases

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?