Which of the following correctly compares the largest sources of earth's energy?
a. the largest source of earth's internal and external energy is the sun.
b. the largest source of earth's internal and external energy is radioactive decay of heavy elements.
c. the largest internal source of earth's energy is the radioactive decay of heavy elements. the largest external source of earth's energy is the sun.
d. the largest internal source of earth's energy is the sun. the largest external source of earth's energy is the radioactive decay of heavy elements.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation: