As an Astronaut goes out into space, her mass REMAINS THE SAME and her weight DECREASES.
When one travels away from the earth surface, one's mass remains the same but the weight decreases as the gravitation pull decreases.
The experience of weight on earth is as a result of the counteracting forces acting one's body and the ground. When one is in the space, this counteracting force is removed because the ground is no longer pushing back on one's body. Thus, one's weight will decrease in space because gravitational pull is lower above the earth's surface.
Answer: The correct answer is-
B. by mutating their DNA in response to environmental conditions to gain beneficial traits.
Antibiotic resistance in bacteria means the bacteria is not susceptible to the antibiotic that is the effectiveness of antibiotic against the bacteria is eliminated or reduced.
It occurs when bacteria undergoes mutation that is alteration in the genetic material ( for instance, in one mechanism of resistance, mutation changes the protein that was earlier target for the antibiotic).
Therefore, by mutating the DNA in response to environmental condition ( such as exposure to antibiotic in this condition), bacteria gains beneficial characters and become resistant.
Thus, option B) is the right answer.
I believe it is nervous tissue
