What is Biology?

What is an observation for this picture?

When you explain the things you observe, or you make an assumption about what you observed. You are making a(n):

A possible explanation or educated guess to a problem that has not yet been tested. 

Which of these contains steps in the right order?

An explanation based on repeated experimentation and observation.

In 1859, Charles Darwin described a model of how living things change over time. He described this model and the evidence that supported it in a book called On The Origin of Species. Which scientific term is used to describe a testable model that seeks to explain natural phenomena? (Hint: many tests are completed.)

Before a scientific theory is accepted and supported, it has

This part of the experiment serves as a basis of comparison; the one variable being tested has been omitted. 

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, what are the controlled variables?