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
Nata [24]
2 years ago
13

Radioactive isotopes in fossils decay at a constant rate. The ratio of radioactive isotope to stable isotope can be examined to

estimate the age of the fossil or the rock it was found in. This is an example of _______ dating.
A. magnetic
B. relative
C. Precambrian
D. absolute
Biology
2 answers:
Klio2033 [76]2 years ago
8 0
The answer would be known as absolute dating
Anestetic [448]2 years ago
3 0

Answer: D. absolute

Explanation:

Absolute dating can be define as the method of dating in which the chronological age of the fossil or rock can be determined on the basis of radioactive carbon dating. The radioactive carbon is the element which decays after the death of the organism. The half life can be determined on the basis of the decay process which can be linked with the age of evidence.

You might be interested in
Check all that apply as characteristics of myelinated axons. Check All That Apply Myelinated axons transmit nerve impulses via c
stiv31 [10]

Answer:

Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter.

Myelinated axons are more energy efficient than unmyelinated axons.

Explanation:

Neurons are cells that specialize in transmitting messages to each other using a type of electrical signal. These signals carry information from outside your body to the brain, while others are the instructions for the various organs, glands and muscles to carry out functions.

Neurons receive these signals from other neighboring neurons through their dendrites. The signal then travels to the soma of the neuron, which is the main body of the cell, and finally<u> travels down the axon to the synaps</u>e (space between the end of a neuron and another cell). The axon is a neuronal extension through which the electrical signal travels, extending from the soma to other neurons.

<u>There may be layers of myelin, which consist of a layer of fat, covering the axons and where they have the function of acting as insulators to help keep the electrical signal inside the cell, which makes it move faster increasing the speed of transmission of the nerve impulse</u>.

1) Myelinated axons transmit nerve impulses via continuous conduction. FALSE. In the axon, nodes of Ranvier are found at regular intervals along the length of the axon in the myelin sheath that surrounds it. These are small spaces that expose the axon membrane to the extracellular fluid and serve to allow the nerve impulse to travel faster, in a jumping manner and with less chance of error.

2) Myelinated axons transmit nerve impulses in the same manner as unmyelinated axons. FALSE. In an unmyelinated axon, the movement of voltage across the membrane is due to ion flux that is limited by the time it takes for sodium ions to diffuse into the axon. Myelinated axons conduct faster because they are shorter than unmyelinated axons. In the latter, transmission is continuous but slower.

3) Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter. TRUE. The action potential conduction jumps from node to node, thereby they need fewer voltage-gated channels. Unmyelinated axons need voltage-gated channels in along the entire axon.

4) Myelinated axons are more energy efficient than unmyelinated axons. TRUE. The rate at which sodium input through one node can depolarize the axon at the next node is related to the current and capacitance across the membrane. Myelinated axons have faster action potential conduction because it jumps from node to node, thereby they use less energy because they don't have to travel the entire length.

5) Myelinated axons would be unaffected by diseases that attack the CNS. FALSE. For example, Multiple sclerosis (MS) is a demyelinating disease of the CNS in which the immune system attacks the myelin sheath or the cells.

6 0
3 years ago
What would happen if humans were made of prokaryotic cells
bixtya [17]
Oooh really a interesting thing if we were made of prokaryotic cells ....
as we know, prokaryotic cells lacks nucleus and membrane bound organelles.
The majority of prokaryotic <span><span><span><span>DNA </span></span></span></span><span>is found in a central region of the cell called the </span>nucleoid. Then we are not able to do activities like now we do bcz if we  lacks a true nucleus which contains our all genetic info: we are just like prokaryotic organisms....
5 0
3 years ago
Consider the following food chain:
icang [17]
D. that is the correct answer
8 0
3 years ago
Read 2 more answers
What is peristalsis and where does it occur?
Airida [17]
Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. It starts in the esophagus where strong wave-like motions of the smooth muscle move balls of swallowed food to the stomach.
6 0
3 years ago
Read 2 more answers
A biologist discovered a young, four-legged animal. The animal had lungs, seemed to fertilize internally, and its outer surface
navik [9.2K]
The answer should be reptiles!

The characteristics of reptiles are:

1. They are four-legged

2. They have an outer covering of scales

3. They breathe with the aid of lungs

4. Although most reptiles lay eggs, some also give birth to live young (fertilise internally)!

I hope this helps! :)
6 0
3 years ago
Read 2 more answers
Other questions:
  • Ddt was banned from use as a pesticide in the united states because
    11·2 answers
  • Longitudinal waves compress the medium they travel though. One example of a longitudinal wave is a
    6·2 answers
  • Which characteristic is used to divide aquatic biomes into three zones?
    14·1 answer
  • Where is the cerebral cortex located, and what is located there?
    13·1 answer
  • Which two minerals are most common in detrital sedimentary rocks?
    13·1 answer
  • What are the two ways by which the nervous system can control the force generated by a muscle?
    8·1 answer
  • A molecular clock uses mutation rates in DNA to estimate the time that two species have
    7·1 answer
  • Can someone please help?
    13·2 answers
  • Answer ASAP please pic attached
    13·2 answers
  • Under physiological conditions, peptide bond formation and degradation both require enzymes, but only formation requires couplin
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!