Which of the following statements is(are) true regarding bacteria in the human body? (select all that apply.) human bodies may contain pathogenic bacteria, but these are often kept in check by other (nonpathogenic) species. cholera is caused by a bacterium that infects and disables part of the immune system. human bodies contain bacteria that are beneficial to certain processes (for example, digestion).

The correct answers are:

•Human bodies may contain pathogenic bacteria, but these are often kept in check by other (nonpathogenic) species.

•Human bodies contain bacteria that are beneficial to certain processes (for example, digestion).

Non-pathogenic species or normal flora are present in the different parts of human body such as oral mucosa, skin, seminal fluid, uterus, lungs, saliva.. Microbiota of normal flora are usually commensal (co-exist without harming effects on humans) whie some of them even have a mutualistic relationship with their human hosts (benefits for both) such as those hosted in the intestine.

answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.