STAAR Review DAY 9 ORGANISMS AND ENVIRONMENTS TEKS 8.11A (R), 8.11B (R), 7.10B (S), 7.10C (S), 7.11C (S), 8.11D (S) © Hedgehog Learning

Food Webs and Energy In the food web to the left, what role does the Sun play? Identify the producers, consumers, and decomposers. How does the ant play a part in the food web? What would happen to the snake population if the rabbits were over-hunted? © Hedgehog Learning

Food Webs and Energy SUN – Source of Energy PRODUCERS – Plants CONSUMERS – Rabbit, Grasshopper, Snake, Mouse, Eagle DECOMPOSER – Ant If the rabbit population decreased, the snake population would as well. © Hedgehog Learning

Parasites © Hedgehog Learning A parasite is an organism that must get its energy from another organism. Sometimes the relationship is mutually beneficial. Sometimes one organisms causes the other harm. Can you think of a parasite that benefits it host? What about the mosquito in the picture?

Ecosystems Look at the ecosystem in the picture to the left. Suppose a fire disturbed this area 10 years ago. How has ecological succession occurred since then. How is competition for resources occurring in this ecosystem? © Hedgehog Learning

Ecosystem © Hedgehog Learning In this ocean ecosystem, how are organisms are competing for: Sunlight Living space Food Oxygen

Natural Selection How does natural selection explain why giraffe’s have long necks? Why is biodiversity important to natural selection? © Hedgehog Learning

Natural Selection How does natural selection explain why giraffe’s have long necks? Why is biodiversity important to natural selection? Natural selection would suggest that only the giraffes with long necks would be able to reach the leaves on the trees. Biodiversity indicates there are many gene traits among all the giraffes for natural selection to “choose” from. © Hedgehog Learning

© Hedgehog Learning

© Hedgehog Learning

© Hedgehog Learning

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