In this ecosystem, squirrels find and eat acorns from trees. what would happen to the balance of the ecosystem if populations of squirrels decreased? a.) the number of acorns would increase. b.) the number of acorns would decrease. c.) the number of acorns would stay the same. d.) the number of acorns would decrease and then increase.

Which quantities are scalars? choose all that apply a. distance b. speed c. acceleration d. velocity

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.