A student observes that plants grown in soil with added coffee grounds seem to grow taller. Based on this observation, which of the following is the best testable hypothesis?

An environmental scientist notices that fish populations in a lake decline significantly after heavy rainfall. Which of the following is a testable hypothesis based on this observation?

All of the following organelles are enclosed by at least one membrane, EXCEPT:

Which of the following questions is most suitable for investigation using the scientific process?

What specifically happens to a bacterial cell during plasmolysis?

When a neuron releases a neurotransmitter into the synaptic cleft, and that neurotransmitter diffuses across the tiny gap to act on a neighboring neuron, this is an example of what type of signaling?

Which statement best defines the historical concept of spontaneous generation?

In the scientific name Homo sapiens, what does “sapiens” represent?

Water’s unique property of having a lower density as a solid (ice) than as a liquid is crucial for aquatic life. What is the primary reason for this phenomenon?

The diffusion of oxygen from the lungs into the bloodstream is an example of molecular motion driven by _____.