Answer:
The word that is missing is Depletion.
Explanation:
Depletion of coral reefs can happen as a result of excessive fishing. The demand for fish increases alongside the growing population rate.
One consequence of unsustainable and unmanaged fishing is that certain fish species may be overfished, potentially leading to extinction.
This creates an ecological disruption, which hastens the decline of the Coral Reef.
Cheers!
Answer:
Cells within a large multicellular organism communicate through chemical signals. These signals are relayed from one cell to another. A cell must have a receptor for that chemical to interpret and respond to a signal.
Explanation:
To initiate a physiological response, all body cells possess specific proteins known as receptors. These receptors are essential for detecting chemical signals and eliciting responses. Different receptors are tailored for various chemical signals; for instance, a dopamine receptor engages with dopamine molecules, whereas an insulin receptor specifically binds to insulin molecules. Additionally, certain cells may also respond to mechanical signals.
Answer:
1. Mutation- enhances genetic variation
2. Selection- may raise, lower, or maintain genetic variation
3. Genetic drift- diminishes genetic variation.
4. Gene flow- could either enhance or reduce genetic variation
Explanation:
1. Mutation denotes changes in an organism's DNA. The mutations lead to new adaptive traits that evolve, which increases the genetic diversity of organisms.
2. Natural selection favors organisms best suited to their environment. Thus, selection can increase, decrease, or keep variation in a population steady.
3. Genetic drift occurs due to random events altering a population's gene pool. When this phenomenon transpires, the genetic variation within that population typically decreases.
4. Gene flow involves changes to the gene pool due to immigration and emigration. This factor can thus increase or decrease genetic variation.
c. PP
Jake exhibits a dominant trait for polydactyly, thus he must be PP or Pp. Lucy, having a normal toe count, has a recessive genotype, confirming she is pp.
If Jake were Pp, a breeding scenario of Pp X pp would result in half Pp and half pp kittens, indicating some kittens could be born with the recessive trait of 18 toes. However, none of the kittens possess 18 toes, all displaying a range of 21 to 25 toes. Therefore, Jake cannot be Pp .
Jake must be PP, as a cross of PP X pp guarantees that all kittens will have the Pp genotype, demonstrating the dominant pheno-type of polydactyly. Each kitten exhibits more than the recessive count of 18 toes, hence they are Pp. The variability in toe count arises from the trait's variable expressivity.
