Answer:
Both biotic and abiotic factors affect the survival and reproductive success rate of fishes in an ecosystem.
The number of predators that a particular type of fish will have will influence the survival and reproductive rate of that fish. An increased number of predators will mean that the fishes will not be able to survive in that ecosystem and will be eaten up.
The number of preys will also affect the survival rate of fishes in an environment. The lesser the number of preys, the more the competition for food among species.
Abiotic factors like the concentration of salts in water will also influence the survival and reproduction of fishes. If a fish is not adapted to live in saline water conditions, then accumulation of salts in the ecosystem might destroy the whole fish species in that ecosystem.
Human activities, like the throwing of wastes into the aquatic ecosystem, drainage of fertilizers in the aquatic system can also destroy the survival and reproduction rate of a particular kind of aquatic animal species.
Explanation:
The principles of fossil succession and natural selection are connected to Rocks and fossil fuels respectively.
<h3>Define principle of Fossil Succession ?</h3>
A method for determining the relative age of a fossil is through fossil succession. It can put the fossils in chronological order by using the geological strata to identify the rock layers where they are located.
<h3>Principle of fossil selection .</h3>
The law of fossil succession, also referred to as the principle of fossil succession, is based on the observation that sedimentary rock strata contain fossilized flora and fauna and that these fossils succeed each other vertically in a definite, reliable order that can be recognized over considerable horizontal distances.
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Answer:
True breeding
Explanation:
One of the main reasons behind the success of Mendel's experiments was that he started the experiments with pea varieties that were true breeding. It is important to understand what a true breeding variety is, it is a plant or organism that is homozygous for a certain trait, in Mendel's case, the pea varieties were homozygous for seven traits, which are : seed coat tint, pod shape, seed shape, flower color, flower location, unripe pod color, and plant height. It means that the varieties contained two similar alleles of genes for these traits in pea plant varieties he chose. Due to the true breeding nature of these traits, the parent plants produced offspring that showed the phenotype just like their parents.
For example:
Here is a cross between plant with yellow flower with another plant containing yellow flower.Suppose allele for yellow is Y and allele for green is y. Let us see what happens in this breeding:
Parents: YY X YY
Offspring: YY
Again cross between offspring: YY X YY
Offspring: YY
This is true breeding in which offspring contain phenotype of parent in many successive generations.
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Answer:
b. An antihistamine blocks receptors for inflammatory chemicals released from granules within mast cells.
Explanation:
The mast cells situated at the body surfaces are responsible for alerting the immune system when a local infection is detected. This induces the secretion of inflammatory chemicals from granules within the mast cells once activated. Histamine is released which causes the blood vessels to expand and the skin to swell, thereby protecting the body. This leads to the production of symptoms like sneezing and rashes.
This allergic response to the perceived antigen is initiated as a result of the degranulation of the mast cell.
An antihistamine helps in stopping the histamine from affecting the cells in the body by blocking the receptors for the inflammatory chemicals released from granules within mast cells
The answer to this is A protist