Answer:
Here is some background information...
Explanation:
Leeuwenhoek (1633-1723) used melted glass balls to form lenses for apparently crude simple microscopes that nevertheless magnified up to 275 times! Modern tests have concluded that he could have achieved a resolution of two micrometres.
The plasma membrane of the sea urchin egg has receptor molecules that are specific for binding acrosomal proteins .
<h3>What is plasma membrane ?</h3>
Plasma membrane is the outermost covering of the body which selectively permits the entry and exit of different type of materials .
Thus ,it is also called as selectively permeable membrane.it also separates the inner and outer environment of the cell .
It also helps in the diffusion process .
<h3>What are sea urchins ?</h3>
Sea urchins belongs to the animalia kingdom , Echinodermata Phylum, and Echinoidea class . they are small marine animals .Sea urchins are spiny , globular .
Learn more about sea urchins here :
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Answer:
Option D
Explanation:
Samuel Gompers was the head of the largest labor federation of America known as American Federation of Labor. This organization comprised of workers that were skilled artisans, weavers, carpenters etc. He also headed the labor movement after actively forming a union of workers in the cigar industry. He himself was a cigar worker and thus could relate to the plight of the people working there. Young aged children were employed in cigar factories and the wage and benefits were not even enough to support survival of one.
Thus, Samuel arouses his voice to stand against the injustices done to the workers in cigar factory which later turned out to be mass movement.
Answer: There are very high amount stars in our galaxy but OUR solar system has only one star. That star is known as the Sun.
