Math
What is the difference between a ratio and a rate?
A ratio compares two quantities with the same units (or no units at all), while a rate compares two quantities with different units.
What is a food chain?
A food chain is a simple diagram that shows who eats whom in an ecosystem, illustrating how energy moves from one organism to another.
Evaluate the power.
101
10
How do primary consumers differ from secondary consumers?
Primary Consumers: Eat plants (herbivores)
10 2 /19
192/19
What are three ways to write a ratio?
Word Form
Colon Form
Fraction Form
How does a food web differ from a food chain?
A food chain follows a single, linear pathway of energy transfer, whereas a food web consists of many interconnected food chains showing all feeding relationships in an ecosystem.
18
1
What can we learn about the balance of nature from studying food cycles?
Interdependence: Removing one species creates a ripple effect that disrupts the whole system.
Population Balance: Predators and prey naturally control each other's numbers.
Resource Limits: Energy loss limits how many top predators an ecosystem can support.
Zero Waste: Nutrients are constantly recycled to sustain life indefinitely.
19 2/8
154/8
Write an equivalent ratio to 5:3.
5:3 = ______ : ______
5:3 = 10:6
Describe the role of producers in a food cycle.
Producers (plants and algae) are the foundation of the food cycle. They produce their own food
74
2,401
Why is it important to protect all levels of the food web?
Prevent Ecosystem Collapse: Damaging one level triggers a domino effect across the whole web.
Stop Overpopulation: Removing predators causes herbivores to overeat and destroy habitats.
Protect the Energy Base: Losing producers destroys the food source for all animals.
Keep Soils Fertile: Losing decomposers stops nutrient recycling, starving plant life.
−12 − 4 + 16 + 15 =
15
Name an example of a unit rate.
unit rate is 60 miles per hour
What happens to energy as it moves up the trophic levels?
About 90% of energy is lost at each step, passing only 10% to the next level (the 10% Rule).
109
1,000,000,000
What might happen to an ecosystem if a top predator is removed?
Herbivore Population Explodes: Without predators, plant-eating animals multiply rapidly.
Overgrazing & Habitat Loss: Excessive herbivores consume plants faster than they can grow, destroying vegetation and soil stability.
Biodiversity Drops: Other species lose their food and shelter, leading to widespread ecosystem collapse.
15 + 5 − 18 − 13 =
-11
Do 6:3 and 18:9 form a proportion? Prove your answer.
Yes, 6:3 and 18:9 form a proportion because both ratios simplify to the same value (2/1) and their cross-products are equal.
Why are decomposers important in an ecosystem?
Decomposers (fungi, bacteria, and earthworms) are the ecosystem's recyclers.
76
117,649
How do human activities impact food cycles?
Overhunting & Overfishing: Removes top predators, causing prey populations to explode and destroy lower trophic levels.
Habitat Destruction & Deforestation: Removes primary producers, reducing the total energy available to the entire food web.
Pollution & Pesticides: Toxins accumulate up the food chain (biomagnification), poisoning top predators.
Invasive Species: Humans introduce non-native species that outcompete native organisms and hijack food supplies.
1/x = 6/ 60
x=10