SCIENCE

3. The outer layers of plants, fungi and some protist cells which support and protect the cell are called the _____
4. A species in danger of becoming extinct in the near future is referred to as a(an)_________species.
6. Which term refers to the number of protons in an atom and helps to place elements on the Periodic Table?
9. This structure, found in cells, assembles proteins.
10. On the Periodic Table, all elements that are in the same horizontal rows are considered to be in the same ____
11. What is the hormone responsible for causing sudden emotional changes and sexual feelings that occur in males during puberty?
14. The breaking down of rocks on the earth's surface is ____
17. Which area of Earth science includes the study of stars?
18. ____are often slippery substances that are used for cleaning.

1. Which of the following nutrients is used to build and repair cells?
2. In addition to food, what else does a mitochondrion need to release energy?
3. 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?
5. What day is it when the sun is at its lowest elevation in the sky all year and we experience the shortest day of the year?
7. This is the structure in plant cells that captures the sun's energy and changes it into chemical energy.
8. Which subatomic particle is NOT found in the nucleus of an atom?
12. If fish are caught faster than they can breed, what will happen to the population?
13. Which subatomic particle has a positive charge?
15. The study of interactions between organisms and their environment is called_____
16. On the Periodic Table, elements that are in the same vertical column are considered to be in the same_____