Interactions
When you mix salt and water, this type of change occurs.
A physical change
Plants get most of the materials they need for growth from these two things.
Air and water
Gravity is a this that pulls objects downward toward the center of the Earth.
Force
Create a simple food chain with three organisms.
Sun → Plant → Rabbit (or similar: Producer → Primary Consumer → Secondary Consumer)
These are organisms that are introduced to an ecosystem and harm it.
Invasive species
When you mix baking soda and vinegar, bubbles form and heat is released. What type of change is this?
A chemical change
Plants absorb water from the soil through their this.
What is Roots
In which direction does Earth's gravity pull all objects?
Downward (or toward the center of the Earth)
What is the role of a decomposer in an ecosystem?
Breaks down dead organisms and returns matter to the soil
What happens to an ecosystem when its habitat is destroyed?
Organisms cannot survive / Populations decrease / The ecosystem becomes unstable
This type of mixture can be separated again, like salt and water.
A reversible mixture (or physical change)
Plants take in this gas from the air to help them grow and make food.
Carbon dioxide
Provide three pieces of evidence that gravity exists.
Objects fall / Water flows downhill / Objects stay on the ground (any three)
This organism makes its own food using energy from the sun.
A producer or a plant
Explain what factors can upset the stability of a local ecosystem.
Invasive species / Habitat loss / Resource changes / Population changes
A metal spoon is shiny, hard, and conducts heat well. These are all examples of its these.
Properties
A plant is kept in a dark closet with water and soil. Will it grow normally?
No, because it needs sunlight (or light energy) to grow
A heavy rock and a light feather both fall to Earth. Explain why using what you know about gravity.
Both experience Earth's gravitational force / Gravity pulls all objects downward
Draw a food web showing how matter moves through an ecosystem with at least four organisms.
Multiple connected food chains showing energy flow and interactions
Use evidence to explain why some organisms can survive in certain ecosystems but not others.
Different organisms have different needs / Ecosystems provide specific conditions / Organisms need particular resources to survive
Name three observable properties of a material.
Color, texture, hardness, density, shape, etc
Support the argument that plants get materials from air and water, not soil. Provide evidence.
Plants can grow in water without soil / Soil provides nutrients but not primary growth materials / Soil is not the main source
Design an experiment to collect data showing that gravity pulls objects downward.
Drop objects from different heights / Measure distance fallen / Record time / Show objects always fall down
Explain how matter cycles between living and nonliving things in an ecosystem.
Plants get matter from air and water → Animals eat plants → Decomposers break down dead matter → Matter returns to soil and air
Explain why a fish cannot survive on land using what you know about organism needs.
Fish need water to obtain oxygen / Land environment doesn't meet fish's needs