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Juli2301 [7.4K]
3 years ago
13

19. Why are biologists uncertain about how many species are living on Earth?

Biology
1 answer:
VladimirAG [237]3 years ago
7 0

Answer: It is bc we as human kind find many different living things on earth every day in both things such as animals to bacteria.

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A phycologist is interested in determining the proportion of algae samples from a local rivulet that belonged to a particular ph
Reptile [31]

Answer:

The proportion 'p-hat' that were cyanobacteria is 0.76

Explanation:

The proportion of cyanobacteria is the relationship between the whole sample and the actual quantity of cyanobacteria found in the sample, that were not other algae. In general, proportions are written as fractions. The<em> numerator is the number of cyanobacteria in the sample, while the denominator is the total number of organisms in the sample</em>.

So, in the exposed example we know that

  • The sample was composed of 50 algae
  • There were two categories for the sample: algae that were cyanobacteria, and algae that were not cyanobacteria
  • Algae that were cyanobacteria = 38
  • Algae that were not cyanobacteria = 12

If we want to study the relationship between the sample and cyanobacteria and express it as a proportion, then we need to divide the number of cyanobacteria by the number of algae in the sample. This is

38/50 ----> Fraction expression of the relationship between cyanobacteria    

                  and the sample

0.76 ----> Proportion of cyanobacteria in the whole sample.

8 0
3 years ago
Bones function as levers for the muscles to provide movement of the body. What refers to increasing the angle of the joint, thus
tatuchka [14]

Answer:

Extension

Explanation:

Extension refers to a physical position that increases the angle between the bones of the limb at a joint. It is a posterior movement for joints that move backward or forward such as the neck and it happens when muscles contract and bones move the joint from a bent position to a straight position.

Extension of the a joint is limited to 180 degrees. if it goes beyond that, it becomes hyperextension.

Hyperextension is an extreme version of extension. it is an excessive joint movement in which the angle formed by the bones of a particular joint is straightened beyond its normal range of motion. this type of movement is unhealthy and may increase chances of dislocation.

6 0
4 years ago
What are some of the similarities and differences between the bacteria cell and the plant cell?​
Artemon [7]

Answer:

Similarities

  • They both have cell walls
  • They have strong flexible layers surrounding their cell membranes.

Differences

  • Bacterial cells are prokaryotic while plant cells are eukaryotic.
  • Bacterial cells have no membrane bound organelles but plant cells have.
6 0
3 years ago
What are some factors that affect the range of your visible spectrum?
Crank
The amount of light, the medium you are viewing through, the health of your eyes, the shape of your eyes, to name a few
5 0
3 years ago
Armando thinks that it is the very steep hill that makes this river narrow and deep, but his classmate thinks it is the small si
Whitepunk [10]

Answer:

it depends on the force applied but armando idea is correct

7 0
3 years ago
Read 2 more answers
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