The vocabulary words are// Elements, Periodic table, Periods, Groups and atomic numbers. I need help matching the vocabulary words.

mk

Explanation:

1. dmitri mendeleev created the periodic table

2. after spending time studying the elements

3. based on things like atomic numbers

4. seven rows, called periods

5. columns moving up and down are known as groups

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

i think the answer is a.keratin is the pigment responsible for skin color.