Answer : An atom with 7 protons, 6 neutrons,
and 7 electrons has an atomic mass of 13 amu.
Explanation:
As we are give that,
Number of protons
7
Number of electrons =7
Number of neutrons =6
As we know that,
Atomic number =Number of protons = Number
of electrons =7
Atomic mass = Number of neutrons + Atomic
number
Atomic mass = 6 + 7 = 13 amu
Therefore, the atomic mass is, 13 amu
They evolved during the Cambrian explosion.
Answer: D
Explanation:
During embryogenesis, hematopoiesis begins in week 3 in the Yolk Sac, in Pander´s Island or Wolff´s Island, commonly known as the "blood islands". These blood islands develop from the umbilical vesicle, allantois, and chorion. In week 5, blood production starts on the fetal liver, and finally, at week 12 it begins in the bone marrow, spleen and, thymus.
The correct answer is As oceans get hotter, they release more CO2, which then increases atmospheric and ocean temperatures.
<span>
Positive feedback<span> is a process which can be explained like this: </span>A produces more of B which in turn produces more of A.</span> <span>In the example above, high-temperature oceans (A) produce CO2 (B) which then make temperature even higher (A).</span>
