I think the answer is periphery, but it could be wrong.
Answer:
Renewable resources
Explanation:
Living sustainably means that your way of living isn't harmful to the environment and you can "sustain" your way of living over a prolonged period of time. For example, if you cut down a tree you can always plant another.
Answer: Two hydrogen nuclei come together to produce one helium nucleus and two protons, and energy is released.
Explanation:
All stars (including the Sun) at birth begin to fuse two hydrogen nuclei to form helium through nuclear fusion.
In this sense, nuclear fusion is the union of two light atoms, releasing energy in the process, which is the cause of the great luminosity of a star. Especifically, the hydrogen nuclei will begin to fuse, generating helium nuclei in the process and releasing huge amounts of energy.
To unerstand it better:
To shine, the stars transform their hydrogen into helium by means of nuclear fusion. When at half of its life a star is without hydrogen, the nucleus becomes entirely helium and the star declines, becoming colder and brighter due to the energy generated by the nuclear reactions, then the star begins to contract.
Nevertheless, if the star is bigger, this helium will be also consumed and the nucleus transformed in Carbon, then in Oxigen, and so on. Being the last transformation Iron until the star delivers all its energy.
D. Olduvai Gorge
Explanation:
- From 1935 to 1959, Louis and Mary worked hard in several excavations in Kenya and Tanzania, looking for the remains of early humans. Although they encountered many difficulties, both because of the dangerous and inaccessible terrain and the scarce postwar scientific foundations.
- However, the real breakthrough came in 1959, when one morning in the Olduvai Gorge - a region separating the famous National Park from Tanzania's more famous Serengeti National Park - Mary discovered a 1.75 million-year-old hominid skull, later classified as Parantropus boisei.
- This finding was a strong argument that hominids evolved in Africa.
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