-Good experimental design plans how to record data so the data can be published. -Good experimental design involves only one trial in an experiment. -Good experimental design includes logging every step and data point of the experiment.
I think the correct answer would be the first option. Scientists need scientific models because they can often be used to make predictions. Models are representation of a process, natural phenomenon, or an idea that is being used to describe and define the occurrence which cannot be seen directly. These are very useful tools in order to predict certain values that would be tedious to be obtain through experiment. Also, this would help scientists to obtain values that is outside the range of their experiment. Examples of these models are the models of the motions of the earth, sun and the moon.<span />
Answer:
The d-block elements are all metals and most have one or more chemically active d-orbital electrons. Because there is a relatively small difference in the energy of the different d-orbital electrons, the number of electrons participating in chemical bonding can vary.
<span>Our Earth is structured around the densities of the materials which make it up.One property of density is that it determines the way materials in a mixture are sorted. This property of matter results in the layering and structure of Earth's atmosphere, water, crust, and interior.</span>