Creating or controlling a situation by causing something to happen rather than responding to it after it has happened.
<span>B) The volcanic gases released from the deep sea vents are similar to those released into the early atmosphere.</span>
Catalysts lower the activation energy for reactions<span>. The lower the activation energy for a </span>reaction<span>, the faster the rate. Then </span>enzymes speed up reactions<span> by lowering activation energy. Many </span>enzymes<span> change shape when substrates bind.</span>
Since Alex is taking a hepatitis a vaccine, he should receive two doses of which is required with the vaccine. The interval of the two doses is six months apart. Therefore, if he already had receive his first dose, he will receive the second dose after six months starting from after the day that he has been injected.
