Answer:
(4) all scientific explanations are tentative and subject to change and improvement
Explanation:
<em>As new facts or findings emerge about a topic, previous explanations about the topic change or are improved on. That is why findings from researches do not become a theory overnight until they have been tested by several independent researchers.</em>
Even when findings become theories, emergence of overwhelming counterclaims concerning the findings often result in change of the theory. A good example is found in Dalton's atomic theory which claimed that atoms are the smallest indivisible particle of elements. The theory was later disproved by the emergence of the fact that atoms contain proton, neutrons and electrons.
Hence, it is concluded that all scientific explanations are tentative and subject to change and improvement as new facts emerge.
Answer: hypothalamus
Explanation: The body's system for regulating food intake is coordinated by the hypothalamus, which is located under the midline of the brain, behind the eyes: Within the hypothalamus are nerve cells that, when activated, produce the sensation of hunger.
Answer:
the answer is below
Explanation:
The two most important factors in the climate of an area are temperature and precipitation. The yearly average temperature of the area is obviously important, but the yearly range in temperature is also important. ... Some areas have about the same rainfall throughout the year.
rough ER-ER-to-golig transport vesicles- Golgi cisternae- secretory or transport vesicles-cell surface... answer: exocytosis
About 60% of natural conceptions fail to implant properly. One of the reasons may be the failure of the embryo to generate Trypsin, a chemical which induces a receptive environment in the uterus in order for the fetus to be implanted. The excess or lack of chromosomes of the fertilized egg may also be a factor in implantation failure. A weak immune system of the woman may also be an important factor.