Which statements describe the energy in a food web? Select three options.

a. When an organism eats another organism, it loses energy.
b. Producers have the greatest amount of available energy.
Energy can follow many different paths.
c. When an organism eats another organism, it gains energy.
d. Producers have the least amount of available energy.
e. Energy always follows a single path.

Aside from human impact, which of the following causes less water vapor production over a small area? (2 pderivartin

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?