The geological time scale is divided up and organized according to what life forms existed on earth.

a. True

b. False

If an organism reproduces very freely by asexual means, is there any advantage to its also reproducing sexually?

Which body structures transport blood away from the heart? a. arteries b. veins c. mitochondria d. neurons?

Which is the best definition for density? a. the amount of space an object takes up. b. the amount of mass in a given space. c. the measure of the force of gravity on an object.

Why do different DNA fragments travel different distances?

Energy from the sun drives wind movements on earth is what? Oceanography Meteorology Geology Biology Astronomy

Each chromatid within a chromosome contains the same set of genes. true each chromosome contains both dna and protein

After identifying a question, what is the next step of the scientific method?

4.1f your body movement and appearance Says one thing and your Words Say Something else, you're

A sea star (starfish) is attacked and one of its rays is cut off. What will happen? A. A mitotic, asexual form of reproduction called fragmentation will take place. B.

What is removed during the formation of mature RNA in eukaryotes? A. Exons B. Introns C. Codons D. Nucleosomes