Responses of the immune system to usuallyharmless environmental substances are known as
(1) antigen production
(2) chromosomal mutations
(3) pathogens
(4) allergies

Biological classification is the process by which organisms are grouped, sorted, and classified based on their similarities and differences. Organisms are grouped into categories called taxa, which follow a hierarchical system. The major steps involved in biological classification are:

1. Observe and compare organisms: Scientists study various organisms and their characteristics, including physical appearance, behavior, and molecular makeup.

2. Identify shared characteristics: By comparing organisms, scientists identify common traits and features that can be used to group them together.

3. Create taxonomic groups: Based on these shared characteristics, organisms are grouped into hierarchical categories, such as kingdom, phylum, class, order, family, genus, and species.

4. Assign scientific names: Each group and individual organism is given a unique scientific name, usually following the binomial nomenclature system, where the genus and species are used to identify an organism.

5. Continuously revise and update classifications: As new information and discoveries are made, scientists may need to reevaluate and revise the classification system to ensure accuracy and reflect the relationships among organisms.

Overall, biological classification helps scientists to better understand and organize the vast diversity of life on Earth, making it easier to study and conserve species and ecosystems.

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break even means that the total income is equal to the total cost.

Therefore, we can equal the total gain to zero.

We have then:

Equaling zero we have:

Rewriting the polynomial we have:

We observe that the polynomial only has a real solution.

Therefore we have:

Answer:

the year (x) the entrepreneur will break even is:

D. year 4

The number of year (x) that it would take for this entrepreneur to break even is equal to: D. year 4.

How to calculate the year (x) this entrepreneur will break even?

In Economics, breaking even implies that the total revenue of an entrepreneur would be equal to the total cost. Thus, we would equate the total profit to zero as follows:

P(x) = x³ - 4x² + 5x - 20

Equating to zero, we have:

x³ - 4x² + 5x - 20 = 0

Simplifying the polynomial, we have:

(x - 4)(x² + 5) = 0

Note: The polynomial above only has a real solution.

x - 4 = 0

x = 4 years.

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The correct answer is A. True

Explanation:

Tissues are the basic structure of organs in both plants and animals. These are made of groups of specialized cells that have specific biological functions. For example, in animals muscles that support the movement are composed of muscle cells that had a specialized structure and function for this. This also applies to plants that are made of epidermal, vascular and ground tissues. According to this, it is true tissues are made of a grouping of cells as each tissue contains sets or groups of specific cells.