C. testable and observable
<span>There are two hormones that determine whether you fell hungry or full -- ghrelin and leptin. Ghrelin sounds like gremlin, and it's the hormone that makes your stomach churn and says, 'Hey, you gotta eat.' The second, leptin, sends message from fat that tells your brain you are full.</span>
Explanation:
Amoeba is different from plant cell because the plant cell is eukaryotes whereas Amoeba is prokaryotes. so plant cell are more similar in size and are typically rectangular or cube shaped and An amoeba has no definite shape
Natural selection allows nature to chose which species survives. Only the fittest get to pass on their genes. And by fittest i mean the ones that are better adapted to the environment.<span />
Radius temperature and brightness
