Food web with three food chains. Arrows point from one organism to the next in the chain. Chain 1: kelp, kelp crab, sea otter. Chain 2: kelp, sea urchin, sea otter. Chain 3: kelp, sea urchin, horn shark, elephant seal. Which organisms are secondary consumers? Check all that apply.

▪️Kelp
▪️Kelp Crab
▪️Sea Otter
▪️Sea Urchin
▪️Horn Shark
▪️Elephant Seal

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home.what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point