Which organelle is known as the "powerhouse of the cell"?

Emma is driving her car on a highway. She wants to calculate her speed. What formula should she use?

Which planet is known as the "Red Planet"?

Which of the following is an example of a physical change?

Imagine you are a delivery driver like Mason, responsible for ensuring that all packages reach their destinations on time. Which of the following best describes the function of the circulatory system in a similar way?

Benjamin is conducting an experiment to find the density of a rock. He measures the mass of the rock as 250 grams and its volume as 50 cm $$^3$$ . What is the density of the rock?

Kai is watching a moving car on the road. Which of the following is an example of kinetic energy?

Michael is conducting an experiment by placing a plant in a dark room. What will most likely happen to its rate of photosynthesis?

Grace is observing her garden on a sunny day and notices that the leaves of her plants seem to be releasing water into the air. Which process is responsible for this movement of water from plant leaves to the atmosphere?

Grace is at the beach and accidentally mixes some sand into her bag of salt. Which method should she use to separate the salt from the sand after adding water?

Nora is setting up a small circuit for her science project. She notices that the light bulb lights up when she uses a metal wire. Which of the following best explains why metals are good conductors of electricity?

James conducted an experiment where he placed one plant in sunlight and another in a dark room. He observed that the plant in sunlight grew taller. What is the most reasonable explanation for this observation?

Rohan drops a basketball from a height and observes it bouncing several times, each time reaching a lower height. Which scientific principle best explains why the basketball does not bounce back to its original height?

Olivia mixes two clear household cleaning liquids and observes the formation of a white solid at the bottom of the container. What type of change has most likely occurred, and what evidence supports this conclusion?

David and William are observing a population of rabbits in a forest that decreases rapidly after a new predator is introduced. What is the most likely reason for this change in the rabbit population?

Lucas is learning about the states of matter. He wants to know what happens to water when it is heated to 100 degrees Celsius. What is the correct answer?

Which of the following best describes the role of chlorophyll in plants?

These elements are shiny, malleable, ductile, and good conductors of heat and electricity.

On the pH scale, which item will be the most acidic?