Density / Buoyancy
An object has a mass of 300 g and a volume of 150 cm³. What is density?
2 g/cm³
Passengers moving forward when a car stops demonstrate this principle.
inertia / Newton’s First Law?
This is the smallest unit capable of carrying out life processes.
a cell
In the chain grass → rabbit → fox, this organism is the secondary consumer.
a fox
Plants remove this gas from the atmosphere during photosynthesis.
carbon dioxide
An object sinks in water but floats in oil, meaning its density lies between the two liquids.
greater than water but less than oil?
A 4 kg object acted on by a 20 N force will have this acceleration.
5 m/s²
This level of biological organization is a complete living individual, like a human, a tree, or a dog.
an organism
Energy decreases along a food chain because it is lost in this form.
heat
Bees play a key role in ecosystems by performing this process.
pollination
For a fully submerged object, buoyant force depends on the fluid’s density and this quantity.
displaced volume
If one object exerts 15 N on another, the second object exerts this force back.
15 N in the opposite direction
This level includes multiple populations interacting with each other and their environment.
ecosystem
If producers are removed, this will happen to the ecosystem.
it will collapse
Forests help prevent this environmental problem.
soil erosion
A steel ship floats because its overall density is lower than this substance.
water
Walking forward is possible because you push the ground in this direction.
backward
All organisms of the same species in one area make up this level.
population
Food webs are more stable than food chains because they have these.
multiple feeding paths
Wetlands improve ecosystems by filtering this resource.
water
The loss of apparent weight of an object in a fluid equals this force.
buoyant force
Forces of 12 N right and 7 N left combine to give this net force.
5 N to the right
This is the largest level of ecological organization, including all ecosystems on Earth.
biosphere
Removing predators from an ecosystem will initially cause this change in prey populations.
increase
The disappearance of pollinators would cause this major impact on agriculture.
decreased crop (егін) production