Answer:
They used relative dating to date the Burgess Shale fossils.
Explanation:
Absolute dating wasn’t discovered yet.
Answer:
Earth's physical layers: includes lithosphere, based on density of each layer
Earth's Compositional Layers: includes crust, based on chemical makeup of each layer
Explanation:
Barchanoid dunes are sand dunes that form scalloped rows of sand at right angles to the wind. These dunes are crescent shaped individual mounds. <span>Two arms, also called horns, extend from the main body of the dune mound point downwind. </span>
Answer:
The mutations that were found in the parents were mostly somatic mutations
Explanation:
It has been mentioned in the question that leukemia was mainly found in the persons who were directly exposed to the radiation and it was absent in their children so this fact suggests that the mutations that were found in the parents were mostly somatic mutations and thus they are not transferred to the children from their parents. As these mutations were induced due to exposure of radiation so it was induced mutation. And such induced mutations do not get inherited to the offspring.
Allele frequencies in a population may change due to four fundamental forces of evolution: natural selection, genetic drift, mutations and gene flow. Mutations are the ultimate source of new alleles in a gene pool