Answer:
Nucleus and acrosome
Explanation:
Human sperm is the male gamete or sex cell formed by spermatogenesis. It is made of a head, neck, a middle piece and a tail. The sperm head consists of a haploid nucleus and anterior to nucleus, an acrosome. The nucleus contains DNA and nuclear protein and it transfers genetic features from the male to the next generation. The acrosome contains an important enzymes, hyaluronidase and acrosin. These enzymes help to enter head into an ovum.
Answer:
b. Small stagnant pools do not provide enough water to dilute ammonia, which is toxic.
Explanation:
Amongst urinary waste products which are ammonia, urea and uric acid, ammonia is the most toxic, then comes urea which is mildly toxic while uric acid is the least toxic. Various organisms excrete these urinary wastes as per their habitat/adaptations. These waste products have some advantages and some disadvantages over each other. For example, ammonia is extremely toxic so it cannot be retained in the body for a longer time but it requires very less energy to produce ammonia than to produce urea that is why most of the aquatic animals excrete ammonia as urinary waste to save their energy and keep on urinating frequently because they live in water all the time. In a large water pool, excreting this ammonia does not cause toxicity because it gets diluted in the surrounding easily.
In contrast to this, land inhabiting animals like mammals prefer to excrete urea as urinary waste even if they have to spend more energy/ATP to convert ammonia into urea with the help of urea cycle. Land animals have to retain urinary waste products in their body for a longer time as compared to aquatic animals and this is the reason why they urinate less frequently because urea being less toxic can be retained in the body for a longer time.
But african lungfish is an exception to other aquatic animals when it comes to producing urinary waste because they live in small stagnant pools of fresh water and if they will excrete ammonia as waste it will make the habitat toxic leading to their death.
As the mass of the object is increased, the force applied to the object increases to maintain the acceleration of the object.
<h3>
Acceleration of the objects</h3>
The acceleration of the objects is determined from Newton's second law of motion as follows;
F = ma
a = F/m
<h3>for mass of 5 kg and force of 2 N</h3>
a = 2/5 = 0.4 m/s²
<h3>for mass of 7 kg and force of 4 N</h3>
a = 4/7 = 0.57 m/s²
<h3>for mass of 10 kg and force of 6 N</h3>
a = 6/10 = 0.6 m/s²
Thus, from the data above we can conclude that, as the mass of the object is increased, the force applied to the object increases to maintain the acceleration of the object.
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Answer:
The diagram, which illustrates a form of genetic recombination, shows that each allele is granted separately to the daughter cells, which is an example of independent assortment.
Explanation:
Crossing over, fertilization and independent assortment are methods of genetic recombination. The diagram (image) states that A-a and B-b are alleles for different characteristics, found in genes and chromosomes.
Independent assortment it was observed for the first time by Gregory Mendel, during his experiments with peas, describing that alleles -the portion of genes that contains variations of specific characteristics- are unrelated to each other and can be distributed independently in the daughter cells.
In this case, thanks to independent assortment, each parent can pass the characteristics of their genotype separately to the offspring -which will have shared characteristics of both- producing genetic variation in species.
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