Homework 96

What is one definition of the word "trace" as a noun?

• A large amount

• A very small amount

• To copy something

• A loud noise

What is one definition of the word "trace" as a verb?

• To erase something

• To draw something

• To copy something

• To hide something

Match the correct definition of the word tracein these sentences. List the part of speech and the number of the definition.

• Noun 2

• There was a traceof spaghetti sauce on my shirt.

• Noun 1

• The detective used the phone calls to tracethe criminal.

• Verb 2

• We had to trace our hands for an art project.

• Verb 1

• The tape left a trace of stickiness on the box.

What is biodiversity in the context of ecosystems?

• The number of different species of plants and animals in an ecosystem

• The total number of plants and animals in an ecosystem

• The amount of genetic variation within a single species

• The number of ecosystems in a region

Why is biodiversity important for ecosystems?

• It helps ecosystems recover from natural hazards

• It increases the number of predators in an ecosystem

• It reduces the need for food sources

• It ensures that only the strongest species survive

What can happen if a species dies out in an ecosystem with low biodiversity?

• The balance of the ecosystem suffers

• The ecosystem becomes more diverse

• All species in the ecosystem thrive

• The ecosystem becomes immune to natural hazards

How does biodiversity affect the gene pool of an ecosystem?

• It increases genetic variety and reduces in-breeding problems

• It decreases genetic variety and increases in-breeding problems

• It has no effect on the gene pool

• It only affects plant species

What is a potential consequence of low biodiversity on food webs?

• Some animals may overpopulate while others struggle to survive

• Food webs become more stable

• All species find enough food sources

• Predators become extinct

If an ecosystem has 10,000 pine trees but no other types of trees, is it biodiverse? 

• Yes

• No

If an ecosystem loses a species, what might happen?

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