Describe three ways mutations can occur.

Why do scientists believe that the first organisms on Earth were extremophiles?

How are prokaryotes and eukaryotes similar?

Describe the topography in the southernmost quarter of the area. what karst features are present?

What's the difference between using a vaccine and using an antiviral?

A gene family that codes for various hormone receptors has been accumulating nucleotide ubstitutions at a rate of 0.4 per million years.

During what process in the cell cycle does one cell become two cells?

All BUT one description applies to the structure of RNA. That is A) four nitrogenous bases. B) double-stranded molecule. C) contains a phosphate group. D) 5-carbon sugar called ribose.

Although a fetus is relatively protected in its mother's womb, a number of different toxins can harm the fetus. These include lead, mercury, glycol ethers, and many other substances. How do toxins usually reach the developing fetus

What is an abiotic factor of a marine ecosystem? A). Food produced B). Temperature change as you go deeper into the ocean C). Reproduction of animals

1. Suppose that xylem were located only in the roots and stems of a plant. Would fluids in the xylem still move? Explain.