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stira [4]
3 years ago
15

The exact boundaries, limitations, and meaning of species is now known and agreed upon universally.

Biology
1 answer:
Elodia [21]3 years ago
6 0
False, it's extremely difficult for scientists to agree upon what makes relatively close species different when it comes to extremely technical factors. Whether something is simply a single deformation of a specimen/family or the discovery of an entirely new species. However there are species that are concretely defined, like humans, and it's unlikely that evolution will introduce a new version of humanity any time soon - but if it came to be that 5000 years in the future humans were genetically a world different than how we are today, I suspect it would be a long argument on whether or not they should be classified as a new species by their scientific leaders.
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A ________ is a membrane-bound sac found in cells that contains digestive enzymes which break down complex molecules or structur
dexar [7]

A lysosome is a membrane-bound sac found in cells that contains digestive enzymes which break down complex molecules or structure.

Lysosomes are single membrane organelles or vesicles  that  contain enzymes and are  specialized to breakdown complex food materials  such as sugars and proteins, into simpler substances.

Lysosomes are made in a process that begins in the endoplasmic reticulum and ends in the Golgi apparatus which puts the finishing touches to the lysosome before releasing it into the cytoplasm where it floats freely until engaged.

 

8 0
3 years ago
Read 2 more answers
A client with suspected human immunodeficiency virus (HIV) has had two positive enzyme-linked immunosorbent assay (ELISA) tests.
victus00 [196]

Answer:

Western blot should be performed

Explanation:

Generally ELISA test is sensitive to elevated antibodies levels in the blood. Because HIV infection is characterise with increases in antibodies levels(HIV-antibodies levels)of the body, it is usually the first screening test for HIV,however it  is also sensitive to elevated antibody   from  any other infection apart from HIV. Therefore for confirmation, the procedure is to run a second ELISA test, to determine if the antibody rise was due to HIV or not. If the second test turns positive, then Western blot can be applied.

The Western blot through  secondary and primary antibodies binding , separates the  investigating antibodies, and  identity the specif HIV antibodies present  to give a positive HIV-antibody,  confirming ELISA positive test.

Thus for confirmation of HIV specific antibodies  of the blood; ELISA test followed by Western blot is  ideal

6 0
3 years ago
Internal and external fertilization both _____. _____ Select one: a. produce single-celled zygotes b. occur only among invertebr
Natali [406]

Answer:

Option-A

Explanation:

Fertilization refers to the fusion of the male and female gamete to form the zygote.

When the fertilization occurs inside the organism through insemination then it is known as the internal fertilization and when it occurs outside the organism like observed in the amphibians when male and female gametes fuse in the water is known as external fertilization.

Both are different type of fertilization but share a similarity that is the formation of a single cell called the zygote which grows into the embryo by the mitotic division. The embryo later develops into the organism.

Thus, Option-A is correct.

6 0
3 years ago
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iVinArrow [24]
Drinking and cooking is the correct answer 
7 0
3 years ago
DNA evidence is NOT used in court cases to
sergey [27]

DNA profiling is a forensic technique in criminal investigations, comparing criminal suspects' profiles to DNA evidence so as to assess the likelihood of their involvement in the crime. It is also used in parentage testing, to establish immigration eligibility, and in genealogical and medical research. DNA profiling has also been used in the study of animal and plant populations in the fields of zoology, botany, and agriculture.

4 0
2 years ago
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