What is an ecosystem?

• A group of the same species living together

• The interaction between organisms and their environment

• A place where only plants grow

• A single population of animals

According to the "How Ecosystems Clean Earth's Water" article, why is biodiversity important in an ecosystem?

• It makes ecosystems more fragile

• It helps ecosystems function better and be more stable

• It decreases the number of organisms

• It causes ecosystems to break down

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

Which of the following is not a factor that directly affects population size?

• Birth rates

• Death rates

• Weather patterns on other planets

• Availability of resources

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Based on the article set, "The Arctic Ecosystem", why do walleye pollock gather in large groups?

• To hunt other fish

• To reproduce successfully

• To migrate long distances

• To avoid being eaten by zooplankton

Tags

NGSS.MS-LS2-1

What do orca whales mainly hunt, according to the article set, "The Arctic Ecosystem"?

• Only plants

• Small fish and plankton

• Seals, fish, and other marine animals

• Humans

In Populations and Resources Lesson 1.3, what happens when the number of births in a population is greater than the number of deaths?

• The population stays the same

• The population decreases

• The population increases

• The population disappears

How do wetlands help clean Earth's water, according to the article, "How Ecosystems Clean Earth’s Water"?

• They speed up the flow of water to remove dirt

• Plants filter harmful substances and bacteria break them down

• They prevent water from mixing with harmful chemicals

• Wetlands do not play a role in cleaning water

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NGSS.MS-LS2-3

What is a key role of algae, according to "The Arctic Ecosystem" article set?

• They eat other fish

• They produce oxygen and food through photosynthesis

• They help fish reproduce

• They keep the ocean warm

Tags

NGSS.MS-LS1-6

Which of the following statements best describes a stable population (Populations and Resources Lesson 1.3 and 1.4)?

• More births than deaths

• More deaths than births

• Equal number of births and deaths

• No births or deaths at all

What role do oysters play in the ocean, according to the article, "How Ecosystems Clean Earth’s Water"?

• Hunt for fish

• Filter water and remove tiny organisms

• Protect coral reefs from pollution

• Produce large amounts of oxygen