Answer:
skin acts as a protective barrier, therefore it does not secrete hormones
One way is by comparative anatomy. Comparing the similar bone structure of animals gives more proof of this theory. Also, the location of some animals compared to other animals of similar species is very convenient, and supports the theory of natural selection.
Aside from desertification, there is no doubt that human activities are a major cause of soil erosion in general. Construction of roads and buildings, logging, mining, and agricultural production have resulted in large amounts of soil erosion in the U.S. and around the world.
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Answer:
C. Yes. Nonpolar molecules aren't compatible with water.
Explanation:
Blood has the liquid plasma, a watery medium. Fats are nonpolar and can not enter the bloodstream as such. The long-chain fatty acids and monoglycerides enter the absorptive cells of the small intestine and form the triglycerides again.
These triglycerides are packed into chylomicrons by making aggregates with phospholipids and cholesterol and become covered with proteins. These packed fats enter the bloodstream in the form of chylomicrons.
A) <u>Mutation</u> is the original source of variations for plants and other organisms which develops differences among their respective species
Explanation:
Genetic variation leads to the natural differences between each individual and among individuals of a species. The main cause for this variation is due to alleles that cause variations in the composition of genes or the DNA sequences.
A mutation is a genetic variation which leads to the creation of a new allele in a species population. Each variation in the DNA sequence leads to an allele formation and each allele leads to a difference in character or trait between individuals since they are the alternate version of the original genes.
Although genetic variations could be brought about by crossing over, random fertilization, or independent assortment; mutation is the original source because it provides the basic raw material for all the evolutionary changes.
