Which situation involved mostly biotic factors? * A) A fungus wipes our a bat population, which allows the mosquito population to
increase and spread disease to people

B) Ocean water getting more acidic prevents coral from growing properly, which harms
the coral ecosystem

C) Dust from a volcanic eruption blocks sunlight to Earth's surface, and as a result the
weather is colder

Second question
Which describes a population depending on an abiotic factor? *

1) A bean plant does not grow well because it is planted where there are many weedy
plants.

2) Coral reef organisms carry out photosynthesis using the sunlight that passes through
from the water above.

3) Squirrels eat eggs from a bird's nest.