Answer:
a. lactic acid fermentation
Explanation:
Under conditions of intense exercise, the oxygen gas obtained by pulmonary respiration may be insufficient to meet the needs of muscle cells in the work of obtaining energy from cellular respiration.
However, even in the absence of oxygen gas, our muscle cells can release the available energy in glucose, leading to even smaller amounts of ATP molecules. Under these conditions, muscle cells perform lactic fermentation, a process that is virtually identical to glycolysis (the first set of cellular respiration reactions), except that pyruvic acid is transformed into lactic acid with the formation of 2 ATPs. Despite the lower energy yield, fermentation ensures the energy supply to the muscle. Lactic acid formed under these conditions has been associated with muscle pain and fatigue characteristic of intense physical exercise. Recent research, however, has shown that pain is caused by muscle fiber micro-injuries rather than lactic acid as it is rapidly metabolized and eliminated.
Answer:
true
Explanation:
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Answer:
The Republic of South Africa has designated three more sites to the List of Wetlands of International Importance: Ndumo Game Reserve, the Seekoeivlei Nature Reserve, and the Natal Drakensberg Park.
Explanation:
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Answer:
Natural selection is an evolutionary process which occurs over hundreds and thousands of years. These effects are visible when we look closely at a population, because they surpass the lifetime of an individual. Moreover, the process of natural selection is involved with the evolution of a whole species, and not just a single individual.
Explanation:
Charles Darwin gave the theory of natural selection to define the process of biological evolution. This theory states that the individuals of a species with heritable traits that are superior or better suited to their environment will survive, and this process continues over time. This leads to the formation of a new species with the continued process of natural selection.
when looking for the evolutionary effects of the natural selection, one need to look over the selected population over a period of time to see the evolved inherited characters. An individual may or may not have these evolved characteristics, and hence, looking at a single individual of a species will not be a success.
Answer:
Yes, photosynthesis is a chemical change
Explanation:
Photosynthesis is the process through which plants convert light energy into chemical energy. Here is the chemical reaction involved: water and carbon dioxide combine to form glucose and oxygen. Since new chemical species are formed, photosynthesis is clearly a chemical change.