Physical Change, although the answer is widely disputed.
Answer:
At its closest, the Sun is 91.4 million miles (147.1 million km) away from us. At its farthest, the Sun is 94.5 million miles (152.1 million km) away. The Earth is closest to the Sun during winter in the northern hemisphere.
Explanation:
Semen is the thick fluid that contains the sperm that is basic in nature, thus protecting it from the acidic nature of the vagina.
Answer: anaerobic respiration
Explanation:
Anaerobic respiration is simply respiration in the ABSENCE OF OXYGEN.
A positive nitrate test mean Escherichia coli reduces NO3 (Nitrate) to NO2 (Nitrite). This is based on its ability to produce nitrate reductase enzyme that catalyze the reduction process. And note that this reaction occurs in the ABSENCE OF OXYGEN.
This makes E. coli an ANAEROBE ( an organism that can survive in the absence of oxygen)
