<h3><u>Answer;</u></h3>
When particles were pulled together so tightly they combined.
<h3><u>Explanation</u>;</h3>
- The solar nebular hypothesis describes the formation of our solar system from a nebula cloud made from a collection of dust and gas.
- It is believed that the sun, planets, moons, and asteroids were formed around the same time around 4.5 billion years ago from a nebula.
- According to this theory, the Sun and all the planets of our Solar System began as a giant cloud of molecular gas and dust.
The answer D. guanine (G)
PDK1 (pyruvate dehydrogenase kinase 1) is an enzyme which inactivates the pyruvate dehydrogenase by phosphorylating it using an ATP molecule<span>.
</span><span>PDK1 (phosphoinositide-dependent protein kinase-1) acts by catalyzing the phosphorylation of Thr-229 (threonine at position 229 in pyruvate dehydrogenase).
This phosphorylation is </span><span>synergistic</span> with the phosphorylation of C-terminal Thr-389, but this one is not done by the PDK1.
