A piece of plastic with a mass of 15 g is placed in a graduated cylinder. The water
level in the graduated cylinder rises from
30 mL to 55 mL when the plastic is added.
Find the density of the plastic.

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

The activity of the modern sample is 1.10 bq . how long does that measurement take?

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).