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1) Seasons, i.e. in the winter, food is less plentiful, causing more animals to die.

2) Human pesticides. (If many animals eat plants with pesticides and fertilizer, they will die.)

If you mean humans, then one is economics. If someone had less money, they probably won't have as many kids. Another is disasters. I kills many people, and if someone's close friend is killed, they will be mourning for a few weeks, not bothering to "Repopulate"

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A factor that tends to cause species to change is a?

change in environmental conditions, such as temperature, rainfall, or availability of resources. This can lead to changes in behavior, physical characteristics, or gene frequencies within a population, ultimately driving evolutionary adaptations.


What are two things that increase a population?

One: size of habitat suitable for habitation. Two: Amount of food/water available. Three: Whether or not, and how many, predators there are. Four: Whether or not, and how many, competitors for one or two there are.


What must be true of all characteristics for it to affect evolution?

For a characteristic to affect evolution, it must be heritable, meaning it can be passed down from one generation to the next. Additionally, the characteristic must influence the survival and reproductive success of individuals in a population. These two factors are essential for natural selection to operate and lead to evolutionary change.


What two factors are required for a character or trait to change over time in population which is adapting through natural selection?

Variation in the trait within the population and differential reproductive success based on that trait are required for a character or trait to change over time in a population adapting through natural selection. The individuals with traits that confer a reproductive advantage are more likely to survive and pass on their genes to the next generation, leading to an increase in the frequency of those traits in the population over time.


When a small population separates from a larger population the allele frequencies change between the two populations. Which is event is most likely to occur from such frequent changes?

Genetic drift is likely to occur when a small population separates from a larger population. This is because genetic drift is the random change in allele frequencies that happens in small populations due to chance events. Over time, these changes can lead to genetic divergence between the two populations.