Nails are made of iron because, iron is strong and sturdy; although nail rust when it undergoes oxidation when expose to water but it is not explosive.
Barium and phosphorus are not suitable for nail making because of their properties.
Barium is an element which reacts with virtually all non metals, forming poisonous products which are dangerous to health and to the environment. It also reacts explosively with water.
Phosphorus is not found in its pure form in nature, it conducts electricity and it is combustible in nature.<span />
External fertilization
In this type of fertilization, the female lays numerous eggs and they are fertilized externally by the males that ‘pours’ its sperm on the eggs.
Explanation:
While laying of many eggs gives an increased chance of diversity in the population, many offspring don't make it to maturity due to low parent care. There is, therefore, more wastage of reproductive energy compared to internal fertilization.
On the other hand, in internal fertilization, the egg is fertilized inside of the female and develops into a young organism before it is birthed. Even though there are fewer offspring produced, the more parental care they receive gives them an increased chance of survival. There is also low reproductive energy loss.
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I believe this problem has the following choices:
a. It was hard to get the fish to breed and produce
offspring for the aquaculturist to raise.
b. Because the fish were stressed in tanks, they required
much more food, reducing the profitability of rearing the fish this way.
c. The fish had to be raised in a community with several
species of fish in the same tank, and they would attack and eat each other.
d. Marine fish are more aggressive than their freshwater
relatives and they tended to fight a lot, often killing some of the other fish
in the tank.
The correct answer is:
c. The fish had to be raised in a community with several
species of fish in the same tank, and they would attack and eat each other.
<span> </span>
Answer: yes
Explanation: he came up with the theory of natural selection which contributes to evolution