Which describes a grizzly bear’s habitat?

Which describes a grizzly bear’s habitat?

all the biotic factors in the ecosystem

all the abiotic factors in the ecosystem

the role of the bear in the ecosystem

the physical area where the bear lives

Interactions between organisms and their environment impact the organism’s overall population. Oahu Amakihi and Kauai Amakihi are two closely related species of Hawaiian honeycreepers. They have a common ancestor, eat small insects and nectar, and like to nest in koa trees. However, one species is found on the island of Oahu, and the other is found on the island of Kauai. Which concept shows the relationship between the Oahu Amakihi and the Kauai Amakihi?

adaptation principle

competitive exclusion principle

niche relationship

predator-prey relationship

A biologist counts the number of zebras in a population each year and notices an increase in the zebra population. Which describes the biologist’s actions?

experimentation

inference

observation

interacting

How would an increase in nest sites affect a population of pigeons?

The population would decrease.

The population would increase.

The population would remain almost the same.

The population would be reduced the next year.

Elephants shape their environment in many ways. They can change a forest to a grassy field or dig a hole that might become a pond. They clear large amounts of vegetation, which removes habitats for some organisms but makes the area inviting for other organisms. Which best describes possible interactions of elephants with the surrounding ecosystem?

positive

negative

neither positive nor negative

both positive and negative

Which is a biotic factor?

rotting carcass

rock

drop of water

fire

A biologist counts the number of rabbits in a population each year and observes a decrease in population. Since the coyote population has exploded, the biologist concludes that the coyote population has had a negative interaction with the rabbit population. Which describes the biologist’s actions?

experimentation

inference

observation

interacting

What term includes all the biotic and abiotic elements in an area?

ecosystem

population

biome

organ

The Phoenix area of the southwestern desert typically receives eight inches of precipitation yearly, in two seasonal patterns. The temperature varies widely between day and night and from season to season, ranging from below freezing at night during the winter up to  49°C (120°F) during the hottest months. Even though it is an arid region, it has high biological diversity. Annual plants such as poppies and lupines flourish, along with woody shrubs such as brittlebush and creosote bush. Thin leaf trees abound, such as palo verde and desert ironwoods. Wide varieties of cactus thrive, such as the cholla, prickly pear, and saguaro. Wildlife includes insects, reptiles, many bird species, small rodents, and other mammals. Which element in the southwestern desert ecosystem is abiotic?

a prickly pear seed

a fallen palo verde leaf

a rainstorm

a wolf spider