vaccines are weakened viruses or bacteria that prompt the body to develop antibodies to foght against disease
Answer:
They are important because they help us understand science theories and allows us to dig deeper into science.
The most common cause is the accuracy of the measure instruments. And the observation of operator is also an important factor. That's why one measurement should do three times and use the average.
The seminal vesicles and prostate gland make a whitish fluid called seminal fluid, which mixes with sperm to form semen when a male is sexually stimulated. The penis, which usually hangs limp, becomes hard when a male is sexually excited. That that