A drought lasts for several months, drying up a lake.
  • Short-term
  • Seasonal
  • Long-term
The extinction of a species leads to ecosystem changes over centuries.
  • Short-term
  • Seasonal
  • Long-term
A severe winter causes some animals to hibernate.
  • Short-term
  • Seasonal
  • Long-term
An oil spill kills fish in a river for a few years.
  • Short-term
  • Seasonal
  • Long-term
What might happen to a population of rabbits if a new predator is introduced into their ecosystem?
  • a) The rabbit population will likely decrease as more rabbits are hunted.
  • b) The rabbit population will increase because the predator will protect them.
  • c) The rabbit population will remain the same, as predators do not affect prey populations.
  • d) The rabbit population will grow faster because the new predator provides more food sources.
If a forest is cut down to build houses, how might the size and distribution of bird populations be affected?
  • a) The bird population will increase because they will adapt immediately to living in houses.
  • b) The bird population may decrease due to habitat loss, forcing some birds to relocate.
  • c) The bird population will remain unchanged, as birds do not rely on trees for survival.
  • d) The bird population will grow larger because there will be more open space to fly.
How could a sudden increase in rainfall affect plant and animal populations in an ecosystem?
  • a) Plant populations may grow due to increased water, providing more food for herbivores.
  • b) Excessive rainfall could cause flooding, harming plants and animals that cannot tolerate too much water.
  • c) Some animal populations may increase due to a greater food supply, while others may decrease if their habitats are destroyed.
  • d) All of the above.
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