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Airida [17]
3 years ago
14

Why are biologists still debating the classification of protozoans? A. Biologists never agree on anything. B. There are estimate

d to be over 50,000 different species. C. Protozoans can be heterotrophic or autotrophic. D. Protozoans can be unicellular or multicellular.
Biology
1 answer:
miskamm [114]3 years ago
6 0

Answer:

B

Explanation:

Answer B is correct:

Because the biologists are continuing to learn more and more about such minute organisms, protozoan systematics – that is,  the taxonomy (classification) and the evolutionary interrelationships of major groups of protozoa – remains a  topic of debate and change, still today.

Some of the rather  LARGE and unwieldy taxonomic groupings of past years are  particularly subject to revision with expansion of and  refinement in the knowledge about the members of those –  and related – assemblages. Paradoxically, the protozoa  themselves are becoming more difficult to define with  precision as our information about them and other microbial assemblages increases. Thus, presenting a single  satisfactory circumscribed definition for them is not an  easy task.

...

Answer A sounds so funny.

Answer C and D are false because Protozoans are usually single-celled and heterotrophic.

...

Hope this answer can help you. Have a nice day!

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ivanzaharov [21]

Explanation:

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3 0
3 years ago
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During DNA replication, what occurs at the origin of replication? A. The two strands that will make up a DNA double helix begin
WARRIOR [948]

Answer:

C

Explanation:

The origin of replication refers to the site at which DNA replication begins. The process of DNA replication - which occurs prior to cell division -  generates a new copy of the DNA.

DNA replication involves unwinding of the DNA double helix, creating a Y shape called the replication fork. The two strands are then replicated, and now there are two DNA molecules, each containing one "old" DNA strand and one "new" DNA strand.

The first stage at the origin of replication is that the enzyme helicase begins splitting apart the strands of a DNA molecule. (C)

The answer is not A, as the two DNA strands are already in the double helix. The answer is not B, as the enzyme responsible for copying the DNA sequence is DNA polymerase, not RNA polymerase. The answer also cannot be D, because although short RNA primers are involved in DNA replication, this does not occur at the origin of replication.

6 0
3 years ago
Explain where photosynthesis takes place? What is the function of this organelle?
Damm [24]

Answer:

Chloroplast

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Explanation:

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8 0
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fgiga [73]

Answer:

To predict the results of the offspring from a cross between brown heterozygous rabbit and a white homozygous rabbit, a punnet square can be drawn as follows:

        b        b

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b   bb         bb

The results from the punnet square show that there is 2:2 ratio that the offspring will be brown coloured or white coloured. The genotype of the rabbits will either be heterozygous brown i.e Bb or homozygous white bb.

there is a 50% chance that the offspring will be brown rabbit and there is also a 50% chance that the offspring can be a white rabbit.

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4 years ago
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