Q: You are presented with the quiz "What reproduces sexually?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "mollusks reproduce sexually" and "clams are mollusks that live in the sea or in freshwater". So, what's the best answer to the question? | OPTIONS:
- ferns
- toads
- legumes
- clams
- fission
- rocks
- the Sun
- bamboo
A: clams

Q: You are presented with the quiz "Plastic and other mulches offer a barrier to what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "spores may be dispersed by moving water, wind, or other organisms" and "plastic and other mulches offer a barrier to spore dispersal". So, what's the best answer to the question? | OPTIONS:
- contamination
- Animal survival
- erosion
- Deposition.
- spores moving
- bacteria
- environment
- high temperature
A: spores moving

Q: You are presented with the quiz " _carry signals that control sexual development and reproduction" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sex hormones are chemical messengers that control sexual development and reproduction" and "chemical messengers carry signals from one nerve branch to another". So, what's the best answer to the question? | OPTIONS:
- sex hormones
- electricity
- nucleic acid
- Most plants
- animals
- genes
- dendrites
- photons
A: sex hormones

Q: You are presented with the quiz "Lung cancer is most often caused by exposure to" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "lung cancer is most often caused by exposure to tobacco smoke" and "tobacco smoke contains tar". So, what's the best answer to the question? | OPTIONS:
- DDT
- UV
- methane
- tar
- CFCs
- vapor
- SO2
- carbon dioxide
A: tar