The following are the reactants of photosynthesis: 1)sunlight , carbon dioxide and water 2)sunlight, carbohydrates and oxygen
3 ) sunlight , water and oxygen

Explanation:

because water is needed for photosynthesis not carbohydrates

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint