Answer:
12. A
13. A
Explanation:
12. A chemical reaction occurs when something new is transformed and changed chemically. The other answer choices, B, C, and D are physical changes; nothing new is really being created.
13. When water is heated to become a gas, that term is called boiling. Hence the name, <em>boiling point. </em>
Answer:
It is most likely C
Explanation:
People get sick and maybe the twin/sibling has a medical condition that may interrupt the experiment.
Speciation<span>. </span>Speciation<span> is the </span>evolutionary process<span> by which biological populations </span>evolve<span> to become distinct species. The biologist Orator F. Cook coined the term '</span>speciation' in 1906 for the splitting of lineages or "cladogenesis", as opposed to "anagenesis" or "phyleticevolution<span>" within lineages.</span>
The electrons are used to generate ATP and its equivalent forms.
Valves
Fluid power is the general term used for systems that use fluids to transfer power from one location to another. The fluid may be a liquid as in hydraulics, or a gas as in pneumatics. In either case, valves are used to control the transmission of power. The valves may be used as a safety mechanism (pressure release value), or as a control mechanism that is automatically, or manually activated.