Answer:
The changes are the organism's adaptive traits and they arise as a result of natural selection. An example of adaptive evolution is the horse's teeth. Its teeth are one of the traits that made it fit for a grass diet. In contrast, genetic drift produces random changes in the frequency of traits in a population
Explanation:
The lining of your mouth is stratified but the lining of your small intestine is not because the primary function of the stratified lining is to protect the body when it comes to close contact to the outside environment.
The mouth has stratified squamous epithelia. This epithelia serves as protection of the mouth from mechanical or chemical abrasion, stress, <span>desiccation, and water loss.
The lining of the small intestine is not stratified because it has a different purpose. It is folded back and forth. This is to ensure that the small intestine has a larger surface area that can absorb nutrients.
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Answer:
The answer is C. External fertilization doesn't require sexual intercourse.
Explanation:
Fertilization is the process by which haploid gametes, sperm and egg, unite to produce a genetically distinct individual.
Fertilization in most of the animals is similar to that in humans. Animals also produce gametes for fusion. But the fusion of gametes may take place inside or outside the body. Based on this, fertilization is of two types – internal and external fertilization.
Internal fertilization
In sexual reproduction, the male inserts the sperms into the female reproductive tract to fuse with the egg. If the fusion takes place within the female parent, it is called internal fertilization.
External fertilization
When the fusion of sperm and egg takes place outside the female parent, it is called external fertilization. Only a minority of organisms exhibit this type of gamete fusion. For example, fish, frogs, etc. Here the female parent deposits her eggs in a place and later, the male parent ejects his sperms over them, then fusion takes place.
Gametes that fuse externally has to face many challenges. Since eggs and sperms are deposited in the external environment, the chances of fusion are very less. Predators may eat eggs and the zygote that is formed. To compensate this loss, organisms like fish and frogs lay hundreds of eggs at a time.
Fungi<span> are </span>beneficial to humans<span> as sources of food and as essential support for other types of food. They are harmful because they are decomposes and are a form of virus.</span>