2. How are a food chain and a food web different?
A. A food chain shows only one path of energy flow whereas a food web shows all the possible food chains in an ecosystem.
B. A food chain shows only one path of energy flow whereas a food web shows how much of the energy is transferred each time.
C. A food chain shows all the possible ways energy flows in an ecosystem whereas a food web shows only one path of energy flow.
D. A food chain shows how much energy is transferred in an ecosystem whereas a food web shows all the possible food chains.

The correct answer is A.

A food chain shows only one path of energy flow whereas a food web shows all the possible food chains in an ecosystem.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.