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abruzzese [7]
3 years ago
9

According to the principle of faunal succession, what must be true of the fossils on a layer below?

Biology
2 answers:
sesenic [268]3 years ago
8 0
The answer to this is older, but it's not a proven fact even though schools teach it as if it were. It is still just a theory if you think about it with how much the earth moves, areas of rock could be complete upside down and no one would know, it would be like history in reverse.
mezya [45]3 years ago
6 0

Answer:

Option (B)

Explanation:

According to the principle of faunal succession, the fossilized plants and animals are deposited in the layers of sedimentary rocks in a vertical manner succeeding one another and they are very distinct, dependable and easily recognized over a broad horizontal distances.

The fossils that are found at the bottom layer is the oldest fossil which have deposited in the ancient time. And the fossils that are present at the top are the youngest fossils and are of geologically very recent.

Thus, the correct answer is option (B).

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What is the advantage of radial symmetry for sessile animals such as hydras and bilateral symmetry for mobile animals such as pl
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Answer:

- Radial symmetry is advantageous because sessile animals can "sit down", take food, or sense harmful environmental conditions from different directions.  

- Bilateral symmetry allows motile animals to move straight forward.

- The major evolutionary advantages of bilateral symmetry include cephalization, the formation of a head and tail area and a more directional motion.

Explanation:

Radial symmetry is advantageous for sessile organisms since it enables the uniform distribution of the sensory receptors around the body. In consequence, sessile organisms can react to environmental stimuli from every direction. On the other hand, bilateral symmetry allows motile organisms the arrangement of a specialized nervous system from the anterior end of the organism (i.e., the 'head'). Moreover, another important advantage of bilateral symmetry is the ability to equalize environmental pressures on both sides of the body, thereby enabling a rectilinear motion.

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For a species with a diploid number of 26, indicate how many chromosomes will be present in the somatic nuclei of individuals th
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Answer:

<h2>Haploid=13</h2><h2>triploid=39 </h2><h2>tetraploid=52</h2><h2>trisomic=14 </h2><h2>monosomic=12</h2>

Explanation:

Given;

A species with a diploid number of 26,  so 26= 2n ( a diploid cell),

so in haploid condition, chromosome number becomes half (13 in this case). triplod is when 2n + n, and 2n +2n ( tetploid). Trisomy and monosomy is the addition or deletion of a sinlge chromosome of a sinlge set  .

Haploid=13, one chromosome from each pair of chromosome set,

triploid=39 (13× 3); diploid+ n( 3n)

tetraploid=52 (13× 4) 4n

trisomic=14 (13+1) ; n+1

monosomic=12 (13-1); n-1

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