SCIENCE

5. A species in danger of becoming extinct in the near future is referred to as a(an)_________species.
7. The study of interactions between organisms and their environment is called_____
10. 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?
12. Which area of Earth science includes the study of stars?
14. 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?
15. Which organelle contains nearly all of a eukaryotic cell's DNA?
17. This is the structure in plant cells that captures the sun's energy and changes it into chemical energy.
19. This structure, found in cells, assembles proteins.

1. If fish are caught faster than they can breed, what will happen to the population?
2. In addition to food, what else does a mitochondrion need to release energy?
3. ____are often slippery substances that are used for cleaning.
4. What is the hormone responsible for causing sudden emotional changes and sexual feelings that occur in males during puberty?
6. On the Periodic Table, elements that are in the same vertical column are considered to be in the same_____
7. Which subatomic particle is NOT found in the nucleus of an atom?
8. Which term refers to the number of protons in an atom and helps to place elements on the Periodic Table?
9. The breaking down of rocks on the earth's surface is ____
11. The longest phase of the cell cycle is______
13. Which subatomic particle has a positive charge?
16. Which of the following nutrients is used to build and repair cells?
17. The outer layers of plants, fungi and some protist cells which support and protect the cell are called the _____
18. On the Periodic Table, all elements that are in the same horizontal rows are considered to be in the same ____