Which best describes a scientific theory? * A) A well-established and highly reliable explanation of a phenomena or situation.
B) Based on many many observations and investigations over time
C) A casual idea
D)Both A and B

Diagram of the evolution of land plants?

2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass