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Which of these statements correctly compares the Echidna life cycle to a Green Sea Turtle life cycle?

• They are both mammals

• They both live mainly in water

• They both lay eggs even though the Echidna is a mammal

• The both have live births

What statement correctly compares the life cycles?

• When they both hatch they look nothing like their adult form

• When they both hatch they look just like their adult form

• They both have 4 stages in their life cycle

• Ladybugs lay eggs and the dragonfly has a live birth.

Which statement does NOT correctly compare the life cycles?

• The polar bear cub and catshark young look like their adult form

• They both have live births to their babies

• They both have an adult form

• They both have a baby form

The partial food web shown below is found in an aquatic environment. This type of environment has many organisms in the same trophic levels. Which two types of organisms in this aquatic food web have a producer–consumer relationship?

• Microscopic algae and white suckers

• Small invertebrates and amphipods

• Phytoplankton and mummichogs

• Amphipods and channel catfish

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which change would most likely occur if all the producers in this ecosystem were removed?

• The mice would become the new producers

• All the animals would either die or move away

• The number of mice would increase

• All the animal populations would increase

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of these human activities would most likely cause an overgrowth of duckweed in a pond environment?

• Gradually introducing geese into the pond

• Fishing in the pond as recreation

• Planting trees in nearby forests

• Heavily fertilizing nearby farm fields

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

A scientist observes sea otters using rocks to break open clamshells. Which of these investigations would best help the scientist determine whether this skill is a learned or an inherited behavior?

• Determining what sizes and kinds of rocks are used most often by sea otters

• Determining whether shellfish are an important food source in the diet of sea otters

• Raising young sea otters away from adult otters that use rocks and observing whether the young otters use rocks

• Observing families of sea otters over time to see whether adults that use rocks have offspring that use rocks

The roots of the prickly pear cactus spread out in a wide underground network. How does this type of root system benefit a prickly pear cactus?

• By producing fruit and storing water

• By capturing sunlight and getting rid of waste materials

• By absorbing water and supporting the plant in loose, sandy soil

• By releasing nutrients into the sandy soil and taking in oxygen

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

What effect does the rapid growth of kudzu most likely have on an ecosystem?

• The variety of native plants decreases

• The water supply in the area increases

• Weather patterns in the area change

• The number of other plants increases

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Fertilizers used on farms near the coast can be carried to the ocean when runoff occurs during rain showers. These fertilizers can decrease the populations of fish and shellfish. Which other populations most likely decrease as a result?

• Organisms that eat algae

• Organisms that live on farms

• Organisms that eat fish and shellfish

• All of these

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4