Concept 2 Multiple Choice (1.5 pts each) 11. Organisms, such as plants or phytoplankton that carry out photosynthesis, would cause a decrease of which gas in the
atmosphere?
A. Oxygen
B. Carbon dioxide
C. Water
D. Ozone

Iknow #2 is d. i just need to know why

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.

In apex! a liquid heated beyond a certain temperature becomes