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3 years ago

Which geologic principle is the reason the top stratum in a section of rock is the youngest?

Biology

2 answers:

OLga [1]3 years ago

7 0

The principle is called the Law of Superposition.

pshichka [43]3 years ago

4 0

Answer: Law of superposition

Law of superimposition is a principle of geology, which suggests that when the rocks gets weathered, the newly formed sediments acquire the top layers of the soil strata whereas, the old layers seeps inside the deeper or bottom layers. As, the bottom layers are covered with new layers of sediments. Hence, new layers are considered as young and bottom layers as old.

Therefore, according to the law or principle of superposition the top stratum in the section of rock is the youngest.

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Cichlids, a type of fish, were introduced to a lake around 200 years ago. Over the years, the fish have developed into two disti

alina1380 [7]

Answer:

sympatric speciation

Explanation:

Different sympatric species have the same closest ancestor and live in the same area but inhabiting different niches.

The steps for sympatric speciation are:

An ancestral species inhabit a geographic area.
With time, different populations of the same species occupy different niches or microhabitats in this general area.
As the microhabitats are different, they have different environmental pressures that are acting on each population.
These pressures lead to the origin of differences between groups, which need to adapt to each environment
Each population suffers genetic changes due to environmental conditions. These changes are inheritable.
With time, these differences drive to the final complete divergence of populations, becoming different species and reproductively isolated.

In sympatric speciation, the interruption of genetic flow must be fast, and there must be differences in niches so no species can compete and displace the other species. Speciation occurs in the same distribution area of the original species. The new species originate in a place with no physical barriers but different environmental pressures.

In the exposed example,

The introduced Cichlid fishes 200 years ago → Original species and the common ancestor between the new derivated species
The lake → general geographic area
The main lake and the streams → Microhabitats or niches with different pressures each
The groups are splitting into two genetically and physically different types of fishes. They do not mate. There is no genetic flow between groups. → Speciation process.

7 0

3 years ago

Mitochondria differ from chloroplasts in that mitochondria

ANTONII [103]

Answer:

Mitochondria differ from chloroplasts in that mitochondria is the energy bank of every cell while chloroplast houses the chlorophyl that gives green pigmentation for photosynthesis to occur in plants

Explanation:

7 0

4 years ago

A(n) ___________ is a collection of all of the abiotic factors and biotic factors in an entire region.

Novay_Z [31]

Ecosystem is correct.

7 0

4 years ago

Read 2 more answers

A closed system is best characterized as a system in which: (3 points)

Anarel [89]

Answer:

A closed system is a physical system that does not allow transfer of matter in or out of the system, though, in different contexts, such as physics, chemistry or engineering, the transfer of energy is or is not allowed.

7 0

3 years ago

As a baseball, player, you hit a home run! If the distance between each of the bases and home plate on a baseball diamond is 90

larisa [96]

Answer:

360

Explanation:

"bases and home plate on a baseball diamond is 90 feet"

your distance and displacement traveled as you finish your home -run jog around the bases

There are 4 bases in baseball.

90x4=360

5 0

3 years ago