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AURORKA [14]
3 years ago
13

5. Which is not one of Darwin's four main ideas of natural selection?

Biology
2 answers:
liubo4ka [24]3 years ago
7 0
The answer will be B
Lesechka [4]3 years ago
3 0
The answer should be b


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What is the advantage of spicules to a loosely constructed animal such as sponge?
AnnyKZ [126]
<span>The spicules have an important purpose for loosely constructed animal such as sponge. First of all, spicules give structure which is vital due to loose construction. Secondly, it protects from predators. This is similar to porcupine quills in serving to protect.</span>
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3 years ago
What would cause antibodies to attack the cells of the body?
neonofarm [45]

Answer:

In autoimmune diseases, such as lupus, multiple sclerosis and rheumatoid arthritis, people produce antibodies that stick to their body's own proteins and attack healthy cells.

Explanation:

5 0
3 years ago
What is the name for a substance that keeps<br> the pH in cells within the 6.5 to 7.5 pH range?
joja [24]

Answer: Neutral

Explanation:

“6.5 to 7.5—neutral. over 7.5—alkaline. less than 6.5—acidic, pH less than 5.5 are considered strongly acidic.“

3 0
2 years ago
Write a 225 word report on why each of the factors (R, K, L, S, C, and P) are important factors needed to determine the amount o
Lostsunrise [7]

Answer:

The R, K, L, S, C, and P factors are -

R - the rainfall erosivity factor,

K - soil erodibility factor

L- the topographic factor derived from slope length

S -the topographic factor derived from slope gradient

C- the cover and management factor

P - the erosion control practice factor

Explanation:

The R, K, L, S, C, and P factors are -  

R - the rainfall erosivity factor,  which depends on geographic location. The greater is the intensity and duration of the rainfall, the higher will bethe erosion potential.  

K - soil erodibility factor,  K signifies the soil loss in tonnes/hectare (tons/acre) for any agricultural land that is cultivated and has a slope length (assumed) of 22.13 meters and slope steepness of 9%. K represents the susceptibility of a soil particle to be easily detached from the surface and carried away by rainfall and runoff. The greater is the value of K , the greater is the erodibility of the soil particles.

L- the topographic factor derived from slope length, It signifies the extent of soil being carried away when slope lengths is greater than an assumed slope length of 22.13 meters. The longer the slope , the higher is the rate of erosion.  

S -the topographic factor derived from slope gradient, It signifies the extent of soil being carried away when slope steepness is greater than an assumed slope steepness of 9%. The steeper the slope , the higher is the rate of erosion.

C- the cover and management factor, It states how effective soil and crop management systems is in terms of preventing soil loss. It is a ratio of soil loss from land under a specific crop and management system to corresponding loss from continuously fallow and tilled land. The higher the C value, the lower is the management process quality to prevent soil erosion

P - the erosion control practice factor,  It represents the after effects of practices pertaining to reduce erosion by reducing the amount and rate of the water runoff. The lower the P value, the better is the effects of practices pertaining to reduce erosion

8 0
3 years ago
(protein)?
belka [17]

Answer:

Since, the original DNA sequence has not been provided, the mutation can be an insertion/deletion or a frameshift mutation.

  1. Mutated DNA
  2. Frameshift mutation/ insertion or deletion
  3. All the amino acids  changed after the  point mutation​

Explanation:

Frameshift Mutation:

  • A frameshift mutation is the alteration in the reading frame of the DNA due to the addition/deletion of one or two nucleotides.
  • This type of mutation moves the mRNA sequence one or two bases forwards or backwards which disrupts the three base codons sequence required for translation into proteins.
  • The CT at the end of the sequence is indicative of a frameshift in the DNA reading frame.
  • Frameshift mutation affect all amino acids in a polypeptide chain as all codons are moved one or two steps forwards or backwards.
6 0
3 years ago
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