D. Things that are kept constant.
Controls are used in an experiment where some variable is being changed. By only changing one thing and keeping the others constant they can make sure that any change in the results is caused by the variable and not the constant, since the constant didn’t change.
Answer:
They may place a sterility indicator with special dye to detect the growth of endospores.
Explanation:
A sterility indicator should be placed inside and in the center of the item that will be autoclaved, if the indicator changes colors that means that the endospores were not killed with the sterilization process and the bacteria survived the high temperatures of the autoclave.
1.) Population density.
2.)Growth rate.
3.)Birth rate.
4.)Death rate.
Answer:
During evolution, plants have acquired a vascular system, which has greatly contributed to the success of land plants. The vascular system allows plants to rapidly transport water and nutrients over long distances between roots, growing deeply in soil, and shoots, growing upward toward the sun.
