A mixture cannot be described by a chemical symbol or formula.
<h3>What is a mixture?</h3>
A mixture is a substance that consists of 2 or more chemically different substances.
Examples of mixtures are sand and salt, water and kerosine, oil and water, etc.
Each substance in a mixture maintains its chemical identity. In other words, components of mixtures do not react with each other.
Thus, the components of mixtures can be recovered using relevant separation techniques.
Mixtures can be homogenous when the different components are uniformly distributed. They can also be heterogenous when the components are skewed to a specific side of the mixture.
Due to the fact that the chemical identity of the components of mixtures remains, it becomes impossible to assign a chemical symbol or formula to mixtures.
Therefore, mixtures can only be named according to the different components but cannot be assigned chemical symbols or formulas.
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According to Darwin's theory of natural selection, struggle for existence leads to survival of the fittest that means natural selection only tends to favour those organisms that are most fit to survive with the reproductive age in a particular environment and to produce offspring.
Those organisms which fail to adapt to acclimatization are likely to become extinct because they won't be able to survive in the changing environment.
<h3>
What is acclimatization?</h3>
Acclimatization is refers to the process where an individual organism adjusts to a change in its environment, allowing it to maintain fitness across a different of environmental conditions.
An example of Darwin theory is if dogs which have a good sense of smell are fit to survive than dogs without a good sense of smell, then all dogs have to evolve a good sense of smell because those with a bad sense of smell die out.
For more information regarding natural selection, refer:
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The question provided is not complete as it lacks the group of choices, however the group of choices are given as follows:
A. A contraction fails to occur because an action potential is not generated in the muscle cell.
B. A contraction fails to occur because this toxin directly prevents ion release from intracellular stores.
C. A contraction fails to occur because neurotransmitter release by the motor neuron is blocked at the neuromuscular junction.
D. A contraction fails to occur because this toxin prevents cross bridge formation and thereby directly prevents contraction.
E. C and D are both true
Answer:
The correct answer is option A : A contraction fails to occur because an action potential is not generated in the muscle cell.
Explanation:
A muscle contraction takes place when action potential bring to muscles by nerves, which is traveled with the help of motor neuron and imitated the muscle contraction.
Acetylcholine or Ach is a chemical messenger to bring the nerve impulses between a nerve and a muscle. If the receptor is block with applying toxin muscle will not contract as ACh will not be able to propagate the nerve impulse to the muscle so there will be no action potential.
The correct answer is option A : A contraction fails to occur because an action potential is not generated in the muscle cell.
Answer:
a) p² = homozygous dominant genotype frequency
2pq = heterozygous genotype frequency
q² = homozygous recessive genotype frequency
b) the population must be randomly mating.
Explanation:
(a) The formula for genotype frequency of a population with p and q alleles is as under:
p² + 2pq + q² = 1
where p allele is dominant over q allele.
Phenotypically p² + 2pq will produce same appearance i.e. dominant phenotype while q² will produce recessive phenotype. So it means that if 80% population is represented by p² + 2pq then 20% will be represented by q².
(b) One of the conditions for a population to be in Hardy-Weinberg equilibrium is that the population must be randomly mating.
Answer:
Sample Response: Based on Newton's second law, if the balls are kicked with the same force, the one with less mass will have a greater acceleration. Since the kickball accelerates more than the soccer ball, it has less mass.
Explanation: