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gayaneshka [121]
3 years ago
15

What main criterion determines major divisions in tje geologic time scale?

Biology
1 answer:
bagirrra123 [75]3 years ago
8 0

Answer:

A) Times of major climate change

Explanation:

The geological time scale is based on major changes in Earth's climate history. This is because of the reason that climate governs the geological processes on Earth. In geology, we study the ages with the help of stratigraphical data where sediment deposition and the fossils it is hosting are the keys to understand the environmental conditions at that particular time. These conditions didn't change significantly unless the climate was changed. An example is the extinction of dinosaurs during K/T boundary event (mass extinction). The most likely reason is the hitting of a meteorite on Earth that changed the climate of Earth in a short period making it least favorable for many organisms to survive.

On the other hand, the occurrence of huge events cannot be used to establish a geological time scale because sometimes, the changes happen more slowly.

Similarly, shifts in the Earth orbits are cyclic however geological time scale doesn't reflect cyclic changes. The same climate can establish in different ages but these events are not used not as a criterion to establish a geological time scale.

In the end, the time span of humans on Earth is very small when compared with the overall geological time scale. Humans record exists from Pleistocene (2,580,000 to 11,700 years ago) to today whereas geological time scale starts in the Archean Eon (4.0 billion to 2.5 billion years ago).

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nikklg [1K]

Answer: Option A "Choroid plexus".

Explanation:

Cerebrospinal fluid can be defined as the fluid that is found in the brain and spinal cord of human beings. It is a clear and colorless fluid.

The production of cerebrospinal fluid takes place by the specialized ependymal cells that lies in the choroid plexuses which is present in the  ventricles of brain.

The amount of cerebrospinal fluid in a day is 500mL. This fluid acts as cushion that protects the brain from mechanical and immunological protection.

Hence, the correction answer is option A

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2 years ago
Please help! Match each organism with the correct trophic level it occupies in the food chain.
ale4655 [162]

Blueberry: 1st Trophic Level

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Hope this helps :P

plz give me the brainliest if it does : )

7 0
3 years ago
Read 2 more answers
What should animals with radial symmetry be better able to do than those with bilateral symmetry?
stealth61 [152]

Answer: They should be able to have access and deal with food distributed homogeneously in 360 degreea

Explanation:

This is because radially symmetrical animals meet their environment equally from every sides or angle e.g sessile while Bilateral symmetrical animals can move actively in only horizontal direction, so that they can eat. E.g Arthropods

7 0
2 years ago
If you are in an emergency and there is no space to the side to steer out of the way of a crash, __________.
lana66690 [7]

The correct answer is controlled braking.

If someone suddenly pulls out in front of the person while driving, the natural reaction is to apply the brakes. Although, this is a good reaction if there is the adequate distance to stop and one applies the brakes accurately.

While in case of emergency stops, one should apply brakes in a way, which will maintain the vehicle in a straight line and permits one to turn if it becomes essential. For this, the person can use stab braking method of controlled braking.

In controlled braking, one applies the brakes as hard as one can without locking the wheels. There is a need to keep steering wheel movements very slight while attempting this. If one needs to make bigger steering amendments or if the wheels lock, release the brakes.


8 0
3 years ago
The chemical structure of a carbohydrate contains repeating units of molecules composed of carbon, hydrogen, and oxygen atoms. W
pochemuha

Answer:

D. sugars

Explanation:

monosaccharides disaccharides polysaccharides blah blah blah sugar made from photosynthesis sugar is carbohydrate blah blah blah

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