7. The use by humans of one species to limit the population growth of another species is termed: (a) natural selection (b) biological control (c) cross-breeding (d) species interaction 8. An aquarium tank in a school laboratory contained mosquito larvae, algae, water snails, tilapia, pond weed, protozoa and water lily.
Which of the organisms in this aquarium form the producer population? (a) Algae, protozoa and pond weed. (b) Waterlily, pond weed and algae. (c) Mosquito larvae, water lily and tilapia. (d) Water snails, algae and protozoa
9. Which of the following natural resources is not renewable? (a) Fish (b) Water (c) Minerals (d) Trees