Answer:
<em>T</em><em>he photograph shows</em><em> soil layers</em><em><u> </u></em><em><u>.</u></em><em><u>T</u></em><em><u>he darkest layer of the soil at the top of the photograph</u></em><em><u> is</u></em><em><u> The Horizon</u></em><em><u>.</u></em>
Explanation:
Called the A horizon, the topsoil is usually the darkest layer of the soil because it has the highest proportion of organic material.
The answer is b. habitat isolation occurs because of available food sources.....
Answer: somatoform or somatic symptom disorder
Explanation:
It is any mental or psychological disorders where patients experience unexplained physical symptoms of illness which are idiopathic and not consistent with general medical guidelines.
Symptoms These depend on the age group of individuals , it usually begins as reoccurring stomachaches, followed by headache in early childhood. As age increases, the symptoms changed to insomnia, fatigues, depression and at chronic state seizure, and paralysis,
Veins have valves that allow them to build up pressure and thus pump blood against gravity
A phylogeny of the same taxa based only on morphological traits:
Some highly conserved genetic sequences can result in unrelated species appearing closely related in a molecular phylogeny, and not reflect the same pattern as the morphologic phylogeny.
Gene sequence changes may not result in morphological changes.
Gene sequences always provide more data than morphological traits.
Morphological analyses always provide more data because each morphological trait is the result of the expression of many genes.
The molecular data may be based on the analysis of introns, which aren't expressed and don't contribute to the evolutionary history of a group of taxa.
Why is molecular data more accurate?
Phylogenetic trees reconstructed from molecular sequences are often considered more reliable than those reconstructed from morphological characters, in part because convergent evolution, which confounds phylogenetic reconstruction, is believed to be rarer for molecular sequences than for morphologies
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