Answer:
Global climate change affects the distribution of species.
Explanation:
In the 50s the model of the atom looked like a planet, with the electrons circling the nucleus. Now we know the elections are shared by many nucleuses so that the model was actually very misleading.
Some isotopes, however, decay slowly, and several of these are used as geologic clocks. Dating rocks by these radioactive timekeepers is simple in theory, but the laboratory procedures are complex. <span>All methods rely on the fact that certain elements (particularly uranium and potassium) contain a number of different isotopes whose half-life is exactly known and therefore the relative concentrations of these isotopes within a rock or mineral can measure the age.</span>
Answer:
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Explanation:
In a diploid organism, one that has two copies of each chromosome, two alleles make up the individual's genotype. ... An example is the gene for blossom color in many species of flower — a single gene controls the color of the petals, but there may be several different versions (or alleles) of the gene.
