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
seropon [69]
3 years ago
12

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. Crinoids are an echinoderm species which

uses anchoring structures called holdfasts to attach themselves to the sea floor. Crinoids were most abundant in Pennsylvania during the Mississippian Period, which ranged from 375 to 320 million years ago. Fossils of the crinoids shows that during most of this time Pennsylvania was ________ that provided favorable conditions for crinoid growth. A) glacial terrain B) a dry and sandy plain C) mostly mountain ranges D) covered by warm, shallow seas
Biology
1 answer:
almond37 [142]3 years ago
8 0

The correct answer is - D) covered by warm shallow seas.

The fact that the crinoids are have an abundance in the fossil records in Pennsylvania in the Mississippian Period, tells us that this area was covered with shallow and warm seas. The reason why we can get that conclusion is that the crinoids live only in that kind of environment, so it simply a logical conclusion.

The geological data is also confirming this, as it is easily noticeable in the layers that during this period of the geologic past, what is now Pennsylvania, was covered with shallow sea waters. Also, this waters were warm too, as the climate was warm and humid and that period, so it was a perfect environment for the crinoids to flourish.

You might be interested in
Which of the following was NOT a motivation for the creation of ASEAN?
irga5000 [103]
<span>ASEAN is an Association of Southeast Asian Nations - a multination association that has as its aim an economic cooperation between Southeast Asian countries (such as Thailand). This association did not arise as a response to external factors, so any reason connected to externam factors would not apply - such as the reliance on some external powers (such as the US). It is focused on the cooperation between the members only - not an external association.</span>
6 0
3 years ago
Read 2 more answers
Which of the labeled structures is an adaptation that is primarily responsible for helping a paramecium control its water balanc
agasfer [191]
The answer is actually structure B
7 0
2 years ago
True or false: The energy contained in the food we eat directly powers all of our cellular activities. If false, please make it
Gwar [14]

Answer:

False

"The energy contained in the food we eat is used to synthesize the energy that directly powers all of our cellular activities".

Explanation:

The food we eat undoubtedly contains energy. This energy is stored in the bonds of the molecules that make up the food. However, the food undergoes the process of digestion to yield glucose (a sugar). This glucose sugar is used in the process of CELLULAR RESPIRATION to synthesize a form of chemical energy usable by cells called ATP.

ATP or Adenosine triphosphate is a molecule that stores chemical energy in living cells. It is the molecule that directly powers all of our cellular activities. Hence, the statement in this question is FALSE. The correct statement should be "The energy contained in the food we eat is used to synthesize the energy that directly powers all of our cellular activities".

5 0
2 years ago
In the eastern region of the former Soviet Union, a railroad was built on the tundra. The surface soil was dug up and tracks wer
Dafna11 [192]
<span>When the surface layer was dug up, the permafrost was exposed. When the weather warmed, this exposed permafrost would have melted and become soggy, causing the ground underneath the tracks to shift.</span>
8 0
3 years ago
Carbon dioxide goes from a solid to a gas without becoming a liquid. This is a chemical change.
Keith_Richards [23]

Answer:

I think its true

Explanation:

hope this helps

6 0
2 years ago
Read 2 more answers
Other questions:
  • How do you figure out the half life of a fossil or rock?
    10·1 answer
  • Give two examples from the transformation of kinetic energy to potential one and vice versa
    11·2 answers
  • Type of active transport were food like molecules are transported into the cell
    7·1 answer
  • A population of frogs inhabits a lake. If the resource availability of the lake changes, the population may to use the resources
    9·1 answer
  • Plants are living organisms. <br> a. True<br> b. False
    14·2 answers
  • What is the electrical charge of an neutron?<br><br> positive<br><br> negative<br><br> neutral
    15·2 answers
  • Enzyms are used for
    10·2 answers
  • What is archaebacterial
    13·1 answer
  • A scientist that studies the climate and weather patterns of the area
    9·2 answers
  • Question:
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!