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
Akimi4 [234]
3 years ago
11

Members of Chondrichthyes are thought to be descended from fishes that had ________.

Biology
1 answer:
ella [17]3 years ago
6 0

The correct answer is B. A bony skeleton

Explanation:

In biology, Chondrichthyes are mainly marine jawed fishes that have cartilage skeletons rather than bone skeletons and also they have paired fins, this includes animals such as rays and sharks. In terms of origin, it is believed this type of fishes are mainly linked to placoderms that were a type of primitive fish that lived during the Devonian period that had a body skeleton as they were covered by hard structures called plates made of bone. Because of this, it is believed this structures evolved into less rigid ones made of cartilage although both the primitive fish and modern Chondrictyles share features such as the structure of jaws. Therefore, Chondrictyles descended from fishes that had a bony skeleton.

You might be interested in
A fossil bone has 25% of this new radioactive element remaining. If the half-life of this new element is 10,000 years, how old i
natali 33 [55]
The element starts off as 100%. half of 100% is 50% and half of 50% is 25%. the element has emitted 2 times the half life which is 10,000 x 2 = 20,000

the fossil bone is 20,000 years old
4 0
3 years ago
When did biology come to be?
svet-max [94.6K]
Hello Yosamy, 
This is a rather broad question but I guess one way you can answer this is.
In the year of 1970 scientists began bio-genetic engineering.
~Naterator
Please Rate and Thank If This Was Helpful <3
7 0
3 years ago
What is the cellular process of sexual reproduction
Lelu [443]
Is the answer. Meiosis
5 0
3 years ago
How does rough er differ from smooth er in structure and function
emmasim [6.3K]
<span>Rough ER is called rough because it has ribosomes attached to its surface. The double membranes of smooth and rough ER form sacs called cisternae. Protein molecules are synthesized and collected in the cisternal space/lumen. When enough proteins have been synthesized, they collect and are pinched off in vesicles.</span>
5 0
3 years ago
Chemicals that help chemical reactions occur at
nikitadnepr [17]
(4) organic catalysts

The job of catalysts in chemical reactions is to make the reaction go faster by lowering the amount of energy needed to activate the reaction. If less energy is needed for the reaction to occur, then the reaction can go faster because a large energy build-up is not needed.
8 0
3 years ago
Other questions:
  • If the substance entering the cell was in higher concentration inside the cell than outside the cell, what type of transport wou
    13·1 answer
  • Helium has an atomic number of two, so its outer energy level is full. Helium is considered _____.
    8·2 answers
  • A bloated corpse was found in the woods with no ants how many days was it there
    14·2 answers
  • 6. How did the disappearance of dinosaurs help the spread of early mammals?
    9·2 answers
  • Treponema and Borrelia A. are luminescent.B. are endosymbionts.C. are spirochaetes.D. are both easily grown on artificial media.
    11·1 answer
  • Place the filling in order for smallest to largest :chromatin,chromosomes ,DNA ,nucleoside ,sister chromatid
    8·1 answer
  • How many parent isotopes based on half lives
    14·1 answer
  • All deserts have high daytime temperatures.
    7·2 answers
  • HELP ME PLEASEEEEE
    5·1 answer
  • What are the keys to biodiversity and ecosystem stability?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!