Which of the following BEST explains why humans selectively breed plants?

Certain bacteria live in the human intestine, where they are protected and make vitamins that the human body uses. What type of symbiotic relationship is this an example of?

Suppose the available nutrients in the soil of an ecosystem decrease. Over time, which adaptation is MOST LIKELY to evolve among the plants that survive there?

In a food chain, what is the role of the fungi?

Which of the following provides the MOST energy to Earth's organisms?

A new species of organism is introduced into an ecosystem in which it has no predators. The organism feeds primarily on mice. What effect is this organism MOST LIKELY to have on the mouse population?

Which of the following is a symbiotic relationship in which both organisms benefit?

If the snake population of an ecosystem suddenly died off, which species would MOST LIKELY increase in number?

As bees gather nectar, they transfer pollen from one flower to another. Which BEST describes the relationship between the bee and the flower?

A cow eats grass to get energy. Which sentence correctly describes the energy transfer?

The Northern spotted owl makes its horne only in old-growth forests. What will happen to a population of Northern spotted owls if all the trees in the forest where it lives are destroyed by a fire?

Some shark species allow small fish to enter their mouths without eating them. The small fish feed on scraps of nutrients around the shark's teeth. The sharks get their teeth cleaned. What kind of relationship is this?

You are having a hamburger for lunch . What was the original source of the energy in the beef of the hamburger?

The tall trees living in a fo rest make it difficult for small plants on the fo rest floor to get the sunlight they need. In terms of sunlight, what kind of relationship exists between the trees and the smaller forest plants?

What effect would the removal of insects and rabbits from an ecosystem MOST LIKELY have?

How could you use a dichotomous key?

In what type of symbiotic relationship does one species benefit while the other is not affected?

A fox eats a rabbit that feeds on plants. The fox is a

Which list below shows the order in which energy flows through an ecosystem?

What is the relationship between human and mosquitoes?

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