Your analysis of your evidence is the most important part of your response essay. It is important that you do not simply restate your evidence or your thesis when constructing analysis. Instead, you should look to explain how the author's technique or use of a character, for example, adds to the theme conveyed.
Land plants (and plants in the ocean, called algae) have a lot of chlorophyll-a pigment because it is essential to photosynthesis, but they also have other pigments, called accessory pigments, that help them absorb light.
Why is the chlorophyll in plants green or even red, orange, or brown? Answer 1: The purpose of photosynthesis is to convert the energy in photons (the infinitesimally small packets of energy that make up light) into the chemical bonds of sugar molecules. Plants (and animals that eat plants) can then store the energy and get it back out when they need it by breaking those chemical bonds.