SCIENCE

2. On the Periodic Table, all elements that are in the same horizontal rows are considered to be in the same ____
4. A species in danger of becoming extinct in the near future is referred to as a(an)_________species.
5. Which term refers to the number of protons in an atom and helps to place elements on the Periodic Table?
9. The study of interactions between organisms and their environment is called_____
11. On the Periodic Table, elements that are in the same vertical column are considered to be in the same_____
12. This is the structure in plant cells that captures the sun's energy and changes it into chemical energy.
13. This structure, found in cells, assembles proteins.

1. Which area of Earth science includes the study of stars?
3. The breaking down of rocks on the earth's surface is ____
6. What is the hormone responsible for causing sudden emotional changes and sexual feelings that occur in males during puberty?
7. Which body system pumps and transports the blood to all parts of the body as well as supply oxygen and remove waste products from body tissues?
8. Which of the following nutrients is used to build and repair cells?
10. The outer layers of plants, fungi and some protist cells which support and protect the cell are called the _____