Answer:
sensillamente la contaminacion del medio ambiente se presenta por el humano o desastres naturales, la contaminacion es: cuando el medio ambiente esta siendo afectado por alguna razon como el humo de una fabrica o deforestacion lo cual causa la extincion de muchos animales.
Explanation:
Human evolution and development is the process by which a human is beings developed on Earth from a now-extinct primates. Viewed from zoologically, we as humans are a Homo sapiens, a culture-bearing the upright-walking species that do lives on the ground and very likely have first evolved in Africa about 315,000 years ago. We are also now the only living members that what many zoologists are refer to as the human tribe, Hominini, but that there is abundant fossil as evidence to indicate that we were also preceded for millions of years by other hominins,
such as Ardipithecus, Australopithecus, and also other species of Homo, and that in our species also lived for a much time contemporaneously with at least one of other member of our present genus, H. neanderthalensis (the Neanderthals). In addition, to we and our predecessors have to always shared the Earth with other apelike primates, from the modern-day gorilla have the long-extinct Dryopithecus. That we can and the extinct of hominins are somehow related to and also that we and the apes, both living and also extinct, are also have somehow the related is accepted by the anthropologists and biologists in everywhere.
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How far deep they were dug up shows us what time period they came from so we can classify what dinosaur it is
Answer:
When the entire lake reaches 40 F, the surface water cools further, dropping below 40 F. Because this water is now less dense than the surrounding water, it will stay on the top and continue to cool. Once the surface water falls to 32 F, it freezes. The freezing then spreads downward into the lake and the ice thickens
Explanation:
Answer:
Two stars (a and b) can have the same luminosity, but different surface area and temperature if the following condition is met:
(T_a^4)(R_a^2) = (T_b^4)(R_b^2)
Explanation:
The luminosity of a star is the total energy that produces in one second. It depends on the size of the star and its surface temperature.
L = σ(T^4)(4πR^2)
L is the luminosity f the star, T is the temperature of the surface of the star and R is its radius.
Two stars can have the same luminosity if the relation between the radius and the surface temperature is maintained.
To see this lets suposed you have 2 stars, a and b, and the luminosities of each one of them:
L_a = σ(T_a^4)(4πR_a^2)
L_b = σ(T_b^4)(4πR_b^2)
you can assume that L_a and L_b are equal:
σ(T_a^4)(4πR_a^2) = σ(T_b^4)(4πR_b^2)
Now, you can cancel the constants:
(T_a^4)(R_a^2) = (T_b^4)(R_b^2)
as long as this relation between a and b is true, then the luminosity can be the same.
