Answer:
Explanation:
Antimicrobials are probably one of the most successful forms of chemotherapy in the history of medicine. It is not necessary to reiterate here how many lives they have saved and how significantly they have contributed to the control of infectious diseases that were the leading causes of human morbidity and mortality for most of human existence. Contrary to the common belief that the exposure to antibiotics is confined to the modern “antibiotic era,” research has revealed that this is not the case. The traces of tetracycline, for example, have been found in human skeletal remains from ancient Sudanese Nubia dating back to 350–550 CE (Bassett et al., 1980; Nelson et al., 2010). The distribution of tetracycline in bones is only explicable after exposure to tetracycline-containing materials in the diet of these ancient people. Another example of ancient antibiotic exposure is from a histological study of samples taken from the femoral midshafts of the late Roman period skeletons from the Dakhleh Oasis, Egypt (Cook et al., 1989). These samples showed discrete fluorochrome labeling consistent with the presence of tetracycline in the diet at that time (Cook et al., 1989). The postulated intake of tetracycline in these populations possibly had a protective effect because the rate of infectious diseases documented in the Sudanese Nubian population was low, and no traces of bone infection were detected in the samples from the Dakhleh Oasis (Armelagos, 1969; Cook et al., 1989).
Rubber bands are different than many other materials because their molecules are actually very long chains, kind of like a tangled pile of spaghetti. These long chains are called polymers, which can behave in surprising ways when you heat or cool them. In this activity you will change the temperature of a rubber band using hot water and ice water, The rubber band actually expands when it gets colder! This seems counterintuitive because most materials expand when they are heated and contract when they get cold. This occurs because of the unusual polymer structure of rubber. When the long chains get hotter and vibrate, they actually shorten, causing the material to contract. When the chains cool down, they relax and stretch out, causing the material to expand.
Answer:
Historians have identified several causes for the emergence of the Renaissance following the Middle Ages, such as: increased interaction between different cultures, the rediscovery of ancient Greek and Roman texts, the emergence of humanism, different artistic and technological innovations, and the impacts of conflict ...
Explanation:
Please mark me as brainliest
Answer:
53.33 hours or 53 hours and 20 minutes.
Explanation:
Given, one travels at 45 miles/hr and another 30 miles/hour.
Let, the slower broom, S1 = 30t
According to the Question,
S1 + 800 = 45t....... (1)
S1 = 45t - 800......(2)
t is constant for because time is equal for both.
Now, putting (1) in equation (2),
30t = 45t - 800
30t - 45t = - 800
15t = 800
t = 53.33
So, the answer is 53.33 hours.
