Biology Examination

4. An __________ species is a species of plant or animal that outcompetes other species, causing damage to an ecosystem.
7. In the Arctic Ocean ecosystem, tiny __________ grow on the underside of ice floes, and tiny shrimp-like organisms eat them.
8. Iron is needed to make _________. If you don't eat enough iron, you may develop anaemia, which makes a person feel very tired.
10. In rice paddy ecosystems, because the water is __________, it heats up quickly during the day and cools down quickly at night.
14. Too much __________ can make your teeth decay and increase the risk of developing diabetes, while too much fat or carbohydrate can make you put on weight.
15. People who don't eat enough vitamin C can get an illness called scurvy, which causes weakness and may result in swollen, bleeding gums.
16. DDT is a __________ chemical, meaning it stays in the environment for many years and is not broken down by decomposers.
17. DDT is an __________ that was first produced in the 1940s and was used to kill insects that transmit diseases like malaria and typhus.
18. __________ are large, complex molecules that play many critical roles in the body and are required for the structure, function, and regulation of the body's tissues and organs.
19. A __________ species is a species that originated and developed in its surrounding habitat and has adapted to living in that particular environment.

1. __________ are trees that can grow with their roots in sea water and form forests along the coasts of many tropical countries.
2. __________ is the process where a substance builds up in an organism's body over its lifetime as it takes in more of that substance.
3. __________ is the process by which the concentration of a compound increases in the tissue of organisms as it travels up the food chain.
5. The place where an organism naturally lives is called its __________, and there are many different places to live in a desert ecosystem.
6. Before humans arrived in New Zealand, there were no __________ mammals there, so many native bird species could safely nest on the ground.
9. An __________ is a network of interactions between all the living organisms and the non-living things around them.
10. Many desert animals are __________, which helps them avoid overheating or drying out during the hot day temperatures.
11. __________ is not actually a nutrient because when you eat it, you cannot digest it, but it helps prevent constipation in the digestive system.
12. Farmers often add __________ to paddy fields, making not only the rice but also the algae grow faster, providing more food for animals.
13. DDT is __________ (poisonous) to many kinds of animals and makes the shells of birds' eggs very thin and easy to break.