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Bond [772]
3 years ago
15

1. Why is it difficult to evaluate thresholds for toxic pollutants? a. Synergistic effects are difficult to account for. b. Ther

e is not enough research on the consequences of multiple exposures. c. Lack of knowledge on the effect of possible interactions of mutiple toxins. d. All of the above
Biology
1 answer:
qaws [65]3 years ago
7 0
The options are all related, and the answer is D) All of the Above. 

The synergistic effects of exposure to multiple toxins are more difficult to quantify and study. As a result, there is not sufficient research on how much a system can take when exposed to multiple pollutants. This lack of research also means that we often do not even know what the effect of these interactions between multiple toxins are.

As a result of these gaps in our knowledge of the interactions between toxins, it is difficult to evaluate the threshold for pollutants, since a system will rarely feature only one pollutant in isolation. 
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This has to do with blind spots: What parts of the eye are involved with this inability to see? How do these eye parts function?
Slav-nsk [51]

Answer:

  • Blindspot
  • It has a vital role. It is the only way out of the optic nerve. By this hole optic nerve exits from the eye and goes towards the brain.
  • It can be proved by a simple experiment. A paper sheet is taken. Then a cross and a circle are drawn side by side on that paper. Then we will focus on the cross. Then by closing one eye and by bringing the paper slowly towards our face, the circle will be disappeared at a certain point.        

Explanation:  

The blind spot is a region on the retina where ganglion cells connect with the optic nerve, and the optic nerve and blood vessels leave the eyeball. There are no receptors in this area so nothing can be translated into vision. That's why the blind spot is unable to see things.

6 0
3 years ago
PLS HELP!!! What best describes the relationship between
rusak2 [61]

Answer:

Interspecific competition

Explanation:

Interspecific competition occurs when two different species occupy the same environment as they coexist and depend on the same limited resources for survival. As a result of these limited resources, there's competition between the different species with each species having their different levels of fitness. Their level of fitness determines how well they will complete with other species. This will also determine if they will go extinct or thrive in such environment where there's interspecific competition.

The graph given shows the growth of the relative population size of two different species grown together.

It shows that P. aurelia, with time, outcompetes P. coudatum.

This graph clearly suggest that interspecific competition has occurred. Both species are competing for the same limited resources.

P. aurelia has a greater fitness which enables it to outcompete the other species sharing the same environment with it.

Interspecific competition beats describes the relationship between the two species in graph B.

5 0
3 years ago
How many chromosomes are there in human ovum​
denis-greek [22]

Answer:

23 chromosomes

Unlike all the other cells in a human body which are diploid, human sex cells are haploid. That means that both sperm cells and ova are haploid; containing only 23 chromosomes.

Explanation:

have a good day!

(─‿─)

7 0
3 years ago
Read 2 more answers
What is true of paremecia
Ber [7]
<span> unicellular ciliates, </span>
8 0
3 years ago
Why does the skeletal system contain both immovable and movable joints? A. Immovable joints allow my bones to move; movable join
Dimas [21]

Answer:

The correct answer is - option B. immovable joints connect my bones; movable joints allow my bones to move.

Explanation:

In the skeletal system, both immovable joints and movable joints are present and both have a distinct role in the body and skeletal system. The immovable joints are the joints that provide the stability to the bones that are connected and maintain the structure these joints also helps in protecting the organs.

Movable joints are the joints that are helpful in movement and allow bones that are connected to feely or up to a limit move.

Thus, the correct answer is - option B. immovable joints connect my bones; movable joints allow my bones to move.

7 0
3 years ago
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