If bacteria are exposed to an antibiotic for the first time. they will: A. lack resistance because without previous exposure to the antibiotic they cannot develop resistance. B. have resistance because their ancestors were exposed to this antibiotic or a similar antibiotic. C. lack resistance because their immune system needs to see the antibiotic in order to develop resistance. D. have resistance if mutations or horizontal gene transfer provide some members of the population with resistance.

Amutagen is 1: a living thing that has undergone a mutation. 2: an agent that causes a mutation in dna. 3: a mutation that has affected one gene. 4: a chemical that can poison living cells.

Asap timed! 1. ice core samples from glaciers ice caps contain bubbles of ancient atmosphere that are in layers based on age. what questions are scientists most interested in? a. how the amount of water vapor needed to make the ice has changed b. how the amount of ozone has changed over time. c. how the amount of ice in each layer has changed over time d. how the amount of carbon dioxide has changed over time 2. what produces milankovich cycles ? a. sunspots ams solar flare on the suns surface b. changes in the earths orbit c. gravitational changes bases on the position of the sun and the moond. cycles of vegetation that result in desert and rainforest conditions

What part of the brain is highlighted in the diagram below?