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Vsevolod [243]
3 years ago
11

I don’t understand this can someone help me

Biology
2 answers:
shtirl [24]3 years ago
8 0

i didnt understand it too sorry

frutty [35]3 years ago
5 0
Answer: C) Longitudinal wave

Explanation: the wave has the same behavior as a longitudinal wave does
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maksim [4K]

Answer: 1. founder effect

2. evolution

3. natural selection

4. species

5. geographically isolated

Explanation: Good luck! :D

8 0
2 years ago
Sequence the steps, 1–4, in the order required to create a permanent slide of human cheek cells. [1 mark] Specimen dehydrated Sp
gogolik [260]

Answer:

The correct order is dehydration, embed in wax, cut into sections, staining

Explanation:

There are certain proceedings needed to obtain stained sections of vegetable or animal tissues for their microscope observations.

These steps are:

  • Obtention of the material: The tissue is cut to an adequate size.
  • Fixation: When tissues are extracted from the organism, they suffer autolysis and putrefaction, so they need to be fixated in order to keep their cells in the best state possible. Fixation involves preserving the original morphological and molecular characteristics of the tissue. Fixation avoids autolysis, putrefaction, distortion, and retraction of cells and the tissue that could affect its volume or morphology.  
  • Dehydration. Once fixated, the fixator must be eliminated and the tissue is dehydrated by using a gradual series of solutions with alcohol in ascendant concentrations. Dehydration must be gradual to avoid tissue deformation.
  • Inclusion. To obtain thin cuts that can be observed under the optic microscope, the tissues must be included in a consistent, firm substance, that might be either hydrophilic or hydrophobic. A hydrophobic medium is paraffin wax, that provides hardness and plasticity.  
  • Cut. The tissue included in wax must be cut in slides or sections thin enough to allow the diffusion and penetration of light. A microtome is used to perform these cuts. When using paraffine for tissue inclusion, the cuts are about  5 to 20 micrometers of thickness.
  • Stain. Once the cuts are performed, paraffin wax must be eliminated. This can be done by using an organic solvent. Then the tissue must be stained. Hematoxylin and Eosin are the most common dyes. Animal tissues in general do not have any natural color, so they need to be stained to be observed.  
7 0
3 years ago
PLEASE HELP ME WITH THIS QUESTION
Brut [27]

Answer:

D

Explanation:

5 0
3 years ago
Read 2 more answers
A child has brown hair and brown eyes. his father has brown hair and blue eyes. his mother has red hair and brown eyes. the best
Elina [12.6K]
The child has inherited both the traits from his parents.
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3 years ago
In the activated sludge process, air and bacteria are added to the incoming sewage.
STALIN [3.7K]

The answer is true. It is because the activated sludge process made use of the aeration in which air being mixed with a substance together with a bacteria and protozoa that is in a biological floc that will help treat the wastewater. 

6 0
3 years ago
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