Which of the following is often provided by anthropologists and biologists as a possible explanation for the development of bipedal hominids?
a. standing upright allowed for sightlines over tall grasses and savannah shrubbery
b. standing upright allowed for better tree climbing
c. standing upright allowed for more efficient movement
d. standing upright allowed for better foraging of tree fruits

The answer is C. Standing upright allowed for sightlines over tall grasses and savanna shrubbery

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the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation:

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.