Answer:
Plant cell. | Animal cell
______________________________|_____________________________
<em> 1. Cell wall is present </em>|<em> 1. Cell wall is absent</em>
<em> 2. cytoplasm is not as desnse </em>|<em> 2. Cytoplasm is dense</em>
<em> as animal cell </em>| <em> 3. Valcoule is genrally absent but if </em>
<em> 3.A large vacoule is present </em>| <em> present they are smaller in size</em>
<em> 4.Plastids are usually present </em> | <em> 4. Plastids are absent</em>
<em> 5.centrosome is absent </em>|<em> 5. Centrosome is present</em>
<em>____________________________________________________________</em>
<em>Hope this helps :D</em>
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:
Beavers and their dams play an important role in nature. Because of the dramatic effects their dams have on surrounding ecosystems, these mammals are considered a keystone species. By constructing dams they create wetlands -- lush environments which attract fish, ducks, frogs and other creatures.
Explanation:
Answer:
The correct answer is 4) They both contain carbon, but only nucleic acids contain phosphorous.
Explanation:
