Answer:
"This is a specific example of a reproductive barrier, called behavioral isolation or sexual isolation".
Explanation:
Reproductive barriers are <em>isolation mechanisms</em> that prevent mating between two or more species. The <u><em>prezygotic mechanism</em></u> avoids fertilization between individuals of different species, and the <u><em>postzygotic mechanism</em></u> avoids the zygote to develop and reach the adult stage.
There are different types of reproductive barriers, one of them is <em>behavioral isolation</em>, also known as <em>ethological isolation</em> or <em>sexual isolation</em>. This is a <em>prezygotic barrier</em> that refers to the fact that <em>many species occupy the same area</em> but they are <em>not sexually attracted</em> to each other and might even be rejected <em>because of behavioral factors</em>, and this is why they do not get to mate. This mechanism includes courtship patterns or mating rituals, and specific chemical signals that allow the recognition between individuals of the same species. A typical <em>example</em> is the <em>recognition songs</em> of some species like frogs, birds, insects, and etcetera.
Answer is C. The man is twenty thousand (2 x 10⁴) times larger than the paramecium.
1 meter (m) = 10⁶ micrometers (µm)
Therefore, 1.7 m = 1.7 × 10⁶ µm
Thus, the length of the man compared to the length of the paramecium will be
1.7 × 10⁶ / 85 = 2× 10⁴ .
Therefore, length of the man is 2× 10⁴ times larger than the length of the paramecium.
Answer:
In the first step of meiosis I, the chromosomes/genetic material of the cell condenses into a visible form, into a form called heterochromatin. The nucleolus also disappears.
In the second step, a process called synapsis occurs. This is when homologous chromosomes align themselves, gene by gene.
In the third step, crossing over occurs. Segments of corresponding DNA are cut and exchanged between non-sister chromatids of the formed tetrads.
In the fourth step, the nucleus fragments, the nuclear envelope fragments, the two centrosomes (if we're talking about an animal cell) separate from each other as their asters and mitotic spindles (mostly microtubules (kinetochore and non-kinetochore) lengthen. The microtubules extending from the centrosomes can now connect to chromosomes.
Answer:
True
Explanation:
During the evolution of eukaryotic cells, the complexity of size and their functions increased, so that a proportional increase in the surface of the <u>cell membrane</u> would be necessary, making it possible for the cell to perform several functions at the same time.
Through differentiations of the structures, it was possible to develop intracellular membranes in the form of organelles capable of performing various functions at the same time, such as cellular respiration and digestion.
A spectroscope
Explanation:
The color of the light emitted by her flashlight can best be studied using a spectroscope.
Spectroscope is an instrument used to observe the light emitted by a substance.
Just like a prism, it splits up light using its different wavelengths.
The light entering the scope is split into its different component parts.
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