The emission of sulfur dioxide causes acid rain, and an erupting volcano emits sulfur dioxide. Given these facts, what causes acid rain among the following options: - Pesticides - fossil fuels - remains of prehistoric life - chlorofluorocarbons - energy of moving objects - an erupting volcano - harmful substances - forest is destroyed
an erupting volcano

Sound can be used for communication by animals, and many animals rely on sounds to communicate to others in their species. Given these facts, what do species rely on to talk among the following options: - Frogs - energy - language - hands - squids - feet - Frogs. - sound
sound

Q: Flowers produce spores that develop into gametophytes, and because ferns lack flowers and seeds, they reproduce through spores. Given these facts, what do ferns reproduce with among the following options: - pollen - heat - a cuticle - sunlight - alleles - spores - chemicals - bushes
A: spores

Question: Transpiration is when water vapor moves from plants into the atmosphere, and when plants give off water vapor during photosynthesis 2. Given these facts, transpiration is part of what process among the following options: - carbon - flow of electrons - plants - conversion of chemical energy - evaporation - Condensation - circulatory systems - photosynthesis
Answer: photosynthesis

*Question*
Most ecosystems get energy from sunlight, and lakes and rivers are extremely complex ecosystems. Given these facts, where do lakes get energy from among the following options: - a delta - water - petroleum - sun's heat - gasoline - Evaporation - sunlight - heat
**Answer**
sunlight

Q: Bottleneck effect occurs when a population suddenly gets much smaller, and population size is the predictor of extinction probability. Given these facts, bottleneck effect can be a precursor to what among the following options: - massive damage - Climate change - Destroy bridges - Cambrian explosion - ground to shake - clams - soda - extinction
A: extinction