Question

wednesday1which ecosystem has the greatest variety of populations because it covers most of earths surface?a. oceanb. grasslandc. forestd. desert2which two organisms are examples of consumers?a. rabbitb. grassc. hawkd. mushroom3which two examples describe decomposers recycling matter in an ecosystem?a. fungi breaking down a fallen logb. worms digesting dead leavesc. a hawk eating a rabbitd. grass growing in sunlight4which two changes could happen if the population of fish in a river decreases?a. more insects the fish usually eat may survive.b. predators that eat fish may lose food.c. the river water will always become saltier.d. trees on the riverbank will stop growing.5true or falseif the number of predators in an ecosystem decreases, the population of prey animals will most likely increase.thursday1several aquatic ecosystems are listed below. circle the saltwater ecosystems. cross-out the freshwater ecosystems. put a star by ecosystems that are considered brackish.ocean lake salt-marshriver streamestuary pond2which of the following is an example of a decomposer?a. grasshopperb. wormc. treed. fish3a hawk eats snakes, and snakes eat mice. which three terms describe the role the hawk serves?producer nutrient recyclerconsumer predatorprey herbivoredecomposer carnivore4if all the producers in a grassland died, what would happen to the herbivores, such as bison?a. they would increase in number.b. they would have no food and decrease.c. they would become carnivores.d. nothing would change.5true or falseremoving one population from a food web can affect many other populations.

Explanation:

Wednesday Section

1. The ocean covers ~71% of Earth's surface and has the highest biodiversity of all ecosystems.
2. Consumers eat other organisms; rabbits are herbivores, hawks are carnivores. Grass is a producer, mushrooms are decomposers.
3. Decomposers break down dead organic matter to recycle nutrients; fungi and worms do this. Hawk eating rabbit is predation, grass growing is production.
4. A decrease in fish would reduce predation on their insect prey (more insects survive) and remove a food source for their predators. River salinity and tree growth are not directly linked to fish population.
5. With fewer predators, prey face less mortality, so their population typically increases.

Thursday Section

1. Saltwater ecosystems have high salinity; freshwater has low salinity; brackish is a mix of salt and freshwater.
2. Worms break down dead organic material, making them decomposers. Grasshoppers/fish are consumers, trees are producers.
3. The hawk eats other animals (consumer), hunts other animals (predator), and eats meat (carnivore).
4. Herbivores like bison rely directly on producers (grass) for food; without producers, they lose their food source and their population decreases.
5. Food webs are interconnected; removing one population disrupts the balance and impacts multiple other species.

Answer:

Wednesday

1. A. Ocean
2. A. Rabbit, C. Hawk
3. A. Fungi breaking down a fallen log, B. Worms digesting dead leaves
4. A. More insects the fish usually eat may survive., B. Predators that eat fish may lose food.
5. True

Thursday

1. Circle: ocean, salt-marsh

Cross-out: lake, river, stream, pond
Star: estuary

1. B. Worm
2. consumer, predator, carnivore
3. B. They would have no food and decrease.
4. True