Answer:
Option A, all of the genes found within the ecosystem
Explanation:
Genetic diversity is very essential to maintain the health of the population of any species. It includes all forms of alleles with in a specific species to ensure variability. Variability is essential to allow evolution of species through mating where species with more desirable genes mate to produce healthy offspring. Sub groups with in a species can also varying set of genes thereby making a gene pool.
Hence, option A is correct
Answer:
The correct answer is: β1 adrenergic receptor activation. Increased in cAMP lead to increased amounts of Na influx (though if channels) and calcium influx of pacemaker cells. This increases the frequency of APs of the pacemaker and increases the rate of contraction.
Explanation:
cAMP generated in response to β1 adrenergic receptors,results in excitation contraction coupling by initiating PKA and causing phosphorylation of L type Ca2+ channels and ryanodine receptors. This increases the concentration of intracellular Ca2+ ions in atrial cells, ventricular cells and AV pacemaker cells. This increase in firing rate. As a result rate of contraction increases.
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The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in. An object will sink if it is more dense than the liquid it is placed in.
So an object denser than water will sink
Answer:
The answer to the question is d
