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Usimov [2.4K]
3 years ago
8

The four major components of the earth's crust are:

Biology
2 answers:
Elena L [17]3 years ago
6 0
Inner core, outer core, mantle and crust
KATRIN_1 [288]3 years ago
4 0
Hydrosphere 
Sedimentary Rock
Basalt Ocean Floor
Granite Foundation
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Wich of these describes a use of biostimulation?
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What term is used to describe a substance given in clinical trials that does not contain the drug?
HACTEHA [7]

Answer:

Placebo, Is used to describe a substance given in clinical trial that does not contain the drug.

Explanation:

  • Clinical trials are done to evaluate the effectiveness of a drug in treating a particular medical symptom or disease.
  • In such case a placebo is used as a control in the experiment.
  • A placebo contains all the components as the medicine except for the drug that is being tested.
  • A placebo is given to one group of patients having the symptoms for which the drug is tested while another group of patients with same symptoms are given the drug.
  • If the group that was given the drug show symptoms of cure  while the group that was given placebo does not show changes. Then the drug is said to be effective.

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The enormous complexity of cells supports the theory of.. inetelligent design or evolution
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5 0
3 years ago
Read 2 more answers
In fruit flies, curved wings (w) are recessive to the dominant straight wings (W), and ebony body (b) is recessive to the domina
lara [203]

Answer:

The correct answer =

parents : WwBb x wwbb

offspring :

WwBb, Wwbb, wwBb, and wwbb

Explanation:

It is given that the straight wings (W) is dominant over curved wings (w) and the ebony body (b) is recessive to the dominant gray body (B) and there is a cross between curved wings and ebony body and straight wings and gray body is made. The phenotypic ratio is: 1:1:1:1 for the four different phenotypes straight gray, straight ebony, curved gray, curved ebony.

It is not given the genotype of parents, however, for the curved and ebony fly, it is clear that both alleles are recessive as recessive alleles only appear in absence of the dominant allele of the trait.

For another parent, the possible genotypes can be  WWBB or WwBb, however in the case of WWBB the phenotypic ratio would not be equal therefore,

crossing WwBb x wwbb

This can be represented in the form of a punnett square as below:

          wb   wb           wb           wb  

WB WwBb WwBb WwBb WwBb Straight wing, Gray body

Wb Wwbb Wwbb Wwbb Wwbb Straight wing, Ebony body

wB wwBb wwBb wwBb wwBb Curved wing, Gray body

wb wwbb wwbb wwbb wwbb Curved wing, Ebony Body

The phenotypic ratio is: 1:1:1:1 for the four different phenotypes

4 0
2 years ago
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