Why must an experiment or a survey be controlled? What is the difference between the control group and the experimental group in a controlled experiemnt?

Directions: Analyze the data table below, then answer the question, "What is the relationship between distance from the Sun and the length of a planet's year (revolution) ?

Which statement correctly describes the nucleus of an atom A. Most volume of an atom is taken up by the nucleus B. the charge on the nucleus determines the charge of the atom C. Most of the mass of the atomis located in the nucleus

Darwin discovered twenty different species of finches in the Galapagos islands. He hypothesized that as new islands arose, finches colonized the islands and rapidly changed into new species, depending on what food was available on each new island.

Which habitat would have the least variation in its salinity? a. salt marsh b. mangrove forest c. lake d. estuary I don't think it's D

Which organism is able to cause an infection? (A) bacteria (B) skin cell (C) white blood cell (D) red blood cell

What is the role of the atp in the cell

What Are Genes? A. the observable characteristic B. the expressed trait C. the basic unit on inheritance D. the measurable factor

Which best describes oogenesis and spermatogenesis?

What is one thing that all types of asexual reproduction have in common?

How is a dog similar to a baseball player?