Answer:
We have just seen that pathogens constitute a diverse set of agents. There are correspondingly diverse ranges of mechanisms by which pathogens cause disease. But the survival and success of all pathogens require that they colonize the host, reach an appropriate niche, avoid host defenses, replicate, and exit the infected host to spread to an uninfected one. In this section, we examine the common strategies that are used by many pathogens to accomplish these tasks.
Explanation:
The first step in infection is for the pathogen to colonize the host. Most parts of the human body are well-protected from the environment by a thick and fairly tough covering of skin. The protective boundaries in some other human tissues (eyes, nasal passages and respiratory tract, mouth and digestive tract, urinary tract, and female genital tract) are less robust. For example, in the lungs and small intestine where oxygen and nutrients, respectively, are absorbed from the environment, the barrier is just a single monolayer of epithelial cells.
Skin and many other barrier epithelial surfaces are usually densely populated by normal flora. Some bacterial and fungal pathogens also colonize these surfaces and attempt to outcompete the normal flora, but most of them (as well as all viruses) avoid such competition by crossing these barriers to gain access to unoccupied niches within the host.
Answer:
They viewed the Panther with fear and set out on a mission to exterminate it.
Explanation:
The first Spanish conquistador to ever sight a Panther was Alvar Nunez Cabeza de Vaca in 1513. When he saw the panther which he referred to as a lion, he was fearful of the animal. He and other Europeans set out on a mission to exterminate all Panthers. This was also necessary as they had to clear the bushes for them to reside.
In 1821 when Florida officially became a part of the United States, and people had to relocate there, a $5 dollar bounty was placed on every Panther killed. The Panthers relocated farther into the wild. As of 1990, the population of the Panther was just around 50. Panthers have since been named an endangered species.
Answer:
The correct answer is - bottom-up processing.
Explanation:
In sensation and the perception process, there are two general processes - Bottom-up processing and top-down processing. Bottom-up processing is the processing that involves the processing of the sensory information is coming in such as the eyes detect any picture, brain collect all the information all together and you perceive a whole picture.
All the information is processed on the base of the sensory information that comes. Bottom-up is basically collecting information and forming it all together.
Thus, the correct answer is - bottom-up processing.
