Which of the following best explains how a biotic factor can control the population of a species in an ecosystem?
a sudden drop in temperature may cause many individuals in a population to die.
competition between two species may force one of them to migrate to survive.
disease may lead to a decline in the reproductive rate of the species’ main predator.
lack of water during a drought may cause many of the individuals in a population to die.

1. the passing of is the basis of heredity. 2. our encode the instructions that define our traits. 3. each of us has thousands of genes, which are made of and reside in our chromosomes. 4. in addition to our genes, the we live in also define our traits. 5. humans have two complete sets of chromosomes. 6. when parents conceive a child, each parent contributes set of chromosomes. 7. every child receives of its chromosomes from the mother and half from the father. 8. this transfer takes place at when the father’s sperm joins the mother’s egg. 9. while most cells in our bodies have two sets of chromosomes, or a total of egg and sperm each have chromosomes. 10. when egg and sperm unite they create a single cell called a 11. each parent contributes complete set of chromosomes to their child. 12. since the parents contribute the chromosomes to each new child, every child inherits a unique set of chromosomes. 13. as a result, every baby will have a combination of traits.

Match the description of each organism to the appropriate category

Environmental science are unconsidered with methods to preserve natural resourcesa.trueb.false