1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
olganol [36]
3 years ago
13

What fossil evidence helped taxonomists separate all "fish" into these two branches for classification?

Biology
2 answers:
wariber [46]3 years ago
4 0

The correct answer is option A, that is, jaw or jawless fishes.

Agnatha refers to the superclass of jawless fish in the phylum Chordata, subphylum Vertebrata, comprising of both the extinct (conodonts and ostracoderms) and present (cyclostomes) species. It comprises the group of all vertebrates with jaws, that is, gnathostomes.

On the other hand, there are two categories of living fish with jaws. The Osteichthyes (the bony fish) and the Chondrichthyes (the cartilaginous fish). Both the categories of fish comprises of two pairs of lateral fins and a finned tail for impulsion in water.


Snezhnost [94]3 years ago
4 0
Invertebrates and vertebrates
You might be interested in
Which statements about the modification of chromatin structure in eukaryotes are true? Select all that apply. View Available Hin
Kay [80]

The correct answers are:  

  • Methylation of histone tails in chromatin can promote condensation of the chromatin.
  • DNA is not transcribed when chromatin is packaged tightly in a condensed form.
  • Acetylation of histone tails is a reversible process.
  • Some forms of chromatin modification can be passed on to future generations of cells.  
  • Acetylation of histone tails in chromatin allows access to DNA for transcription.

Histone modifications are post-translational modifications of histone protein that can affect gene expression by altering chromatin structure or recruiting histone modifiers.The most common modifications are methylation, phosphorylation, acetylation and ubiquitylation. All of them affect the binding affinity between histones and DNA and thus loosening (gene activation) or tightening (gene repression) the condensed DNA.

Histone methylation is a transfer of methyl group by histone methyltransferases to lysine or arginine amino acid of protein. Effect of methylation depends on the type of protein that is modified. Demethylation is the reverse process.

Histone acetylation is the process of adding of an acetyl group(by  histone acetyltransferases) to histone proteins and it can also activate or inhibit the gene expression. Deacetilation is reverse process.

7 0
2 years ago
A medium has an antibiotic added that inhibits the growth of most bateria. only one species of bacteria can grow on this medium.
netineya [11]
The medium would be functionally classified as a growth medium. It is because a growth medium is a media that is being use to observe the growth of bacteria such as having to observe whether it would be inhibited or whether it will grow in the media.
6 0
2 years ago
Which of the following is (are) an example of a variable that is inevitably highly predictive about the details of the anatomy a
SashulF [63]

Answer:A

Explanation:The anatomy and behavior of that animal's immediate ancestor..

6 0
3 years ago
What is the goal of selective breeding
Allushta [10]
The goal is to selectively develop specific desired characteristics in plants or animals, eventually creating the desired offspring. 
3 0
3 years ago
Activities that take place in the cell. Which two
Roman55 [17]

Answer:

NERVOUS AND ENDOCTRINE are activities that takes place in the cells

4 0
2 years ago
Read 2 more answers
Other questions:
  • Which of these organisms is most specialized?
    9·2 answers
  • Can somebody help me?
    10·1 answer
  • I have a question for a graphing homework, "A study is being done on the amount of water needed to grow plants. Five small garde
    8·1 answer
  • Researchers are studying a small island that is home to a unique population of land snails. This population was founded by 10 in
    12·1 answer
  • What happens in an ad hominem persuasive technique? A limited number of options are presented. A person is attacked rather than
    14·2 answers
  • PLZZ HELP
    11·1 answer
  • Which statement describes the law of superposition
    9·1 answer
  • How does the carnivorous plant catch its victums?
    6·2 answers
  • Will this process below ensure with certainty that the offspring will retain their needles? Explain your answer.
    5·1 answer
  • Explain the types of parenchyma tissues with their function​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!