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
Helga [31]
3 years ago
8

What are some examples of index fossils

Biology
1 answer:
nata0808 [166]3 years ago
6 0

Answer:

Ammonites, , Brachiopod, Grapolithina, Trilobites and Nanofossils are examples of index fossils

Explanation:

Ammonites were common during the Mesozoic Era (245 to 65 mya), but were not found after the Cretaceous period. They went extinct during the K-T extinction (65 mya)

Brachiopods which are mollusk-like marine animals appeared during the Cambrian (540 to 500 mya). Some types of them still survive

Grapolithina which are widespread colonial marine hemichordates that also lived during the Cambrian period.

Nanofossils are microscopic fossils which are remains of calcareous nannoplankton, coccolithophores from various eras

Trilobites were common during the Paleozoic Era (540 to 245 mya); about half of the Paleozoic fossils are Trilobites. Trilobites evolved at the beginning of the Paleozoic Era and went extinct somewhere in the late Permian period which was 248 million years ago

This might be extra information but i hope it helps

You might be interested in
What are some bonding properties of ionic compounds
vesna_86 [32]

Answer:

They form crystals.

They have higher enthalpies of fusion and vaporization than molecular compounds.

They are hard.

They are brittle.

Explanation:

3 0
3 years ago
Which of these describes a scientific theory?
lesya692 [45]

Answer:

good question

Explanation:

4 0
4 years ago
Read 2 more answers
Explain in detail how to decide the number of replications in a simulation study. Use fixed-sample-size and sequential procedure
erik [133]

Explanation:

Fixed sample size:

In this fixed sample size the data is studied and checked in order to find a relationship. The benefits it is easy to produce, and with it less reliable outcomes can be given.

Sequential procedures:

→Sequential procedures helps while we are collecting the data.

→At an interim analysis, data collection can be stopped whenever the results are convincing enough to conclude an effect is present.

→Or otherwise the more data can be collected, or if needed the study can be terminated whenever it is extremely unlikely the predicted effect will be observed if data collection would be continued.

→In this two or more blocks of different sizes are prepared for testing.

→Pros being it provides better results and is less time taking, as we can stop once the relation is seen, con being it is difficult to perform.

5 0
3 years ago
The chart below compares the characteristics of four different cells.
Sonja [21]

Answer:

b. cell x because it has chloroplast.

5 0
3 years ago
2 points
rjkz [21]

Answer:

Option B

Explanation:

The presence of these structures in this stage may be a prediction of a common ancestor as these structures are not gills because they do not develop into gills in chicks and humans but being so similar to gill structures in fish at this stage in their embryo suggests that chicks and humans share a common ancestor with fish.

5 0
3 years ago
Other questions:
  • Lower temperatures lead to slower soil formation.
    5·2 answers
  • What should morgan do? research the pros and cons of the atkins' diet, a diet high in fiber and low in saturated fat. also, rese
    11·1 answer
  • What is the anatomy of the heart? What is the physiology of the heart?
    14·2 answers
  • How many cells are in a single drop of blood? explain your answer.
    14·1 answer
  • What is strategic mineral?
    12·1 answer
  • All of the following occur during exercise in order to maintain blood glucose levels, except ______?a. Sympathetic stimulation c
    14·1 answer
  • The Cells in your body get energy from the foods you eat. However, your cells must use energy to get this energy. Why?
    13·2 answers
  • 3. If a plant cell was placed in a solution which was HYPOtonic to the salinity of the cell itself, what would be the expected r
    7·1 answer
  • In order to change C to B to A, one would need to:
    10·1 answer
  • Cells respond to ______ of / with other cells and stop growing.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!