Doctors have fought infections with penicillin for over 50 years. Recently, penicillin has not worked as well as before. Which of the following explanations can account for this observation?

In Drosophila, the genes for body coloration and eye size are on different chromosomes. Normal-colored bodies are dominant to ebony-colored (very dark) bodies, and normal-sized eyes are dominant to being eyeless.

What do clastic rocks form from?

Which sentence best describes the process of convection? a. sunlight travels through space. b. cool air sinks, which forces warm air to rise. c. water vapor in the air forms liquid water. d. A rock melts when magma touches it.

The clavicle can break when catching a fall with outstretched hands. describe how the impact

What are the short, branchlike structures of a neuron that receive signals from receptors or other neurons?

What the surface temperature of the stars classify as white dwarfs be classified higheror lower than that of the stars classified as supergiants

Living animal cells, each with a salt concentration of 1%, are placed in a solution of 30% salt. Which of the following will occur? A.

The duck-billed platypus has 52 chromosomes in its body cells. When the platypus's body cells divide by mitosis, how many chromosomes will each daughter cell have?

What is a prokaryotes in biolog

Which of the following does not represent conditions believed by scientists to have been present on early Earth? A. An atmosphere thick with water vapor B. energy in the form of ultraviolet radiation C. extremely cold temperatures D.