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Vinvika [58]
3 years ago
10

(02.03 HC) Explain how science uses fossil evidence to support the theory of evolution.

Biology
1 answer:
nevsk [136]3 years ago
8 0
The fossil record shows a sequence from simple bacteria to more complicated organisms through time, it is very reliable because it is physical evidence and by studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth.
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Is any FAP considered an innate behavioral response?
Alex777 [14]

Answer

Explanation:

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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
Polysaccharide structure can be varied by differences in ________.
Scilla [17]

Answer:

monomers of MONOSACCHARIDES

Explanation:

Polysaccharides are large molecules formed from chains of POLYMERS linked together by glyosidic bonds. <u>MONOMERS are small sub units that formed polymers, they are therefore the building block of a polysaccharides.  The monomers of polysaccharides are called monosaccharid</u>es (1 sugar molecule.) when two of these are joined together they formed disaccharides (two sugars.)

Polysaccharides are fromed by joining  together condensation, (loss of water molecules,)  of mutiple monosaccharides units and the reversal of this to add water molecules to sepate them to monosaccharies is  sugar Hydrolysis.

Example of polysaccharides are starch, glycogen cellulose

Example of monosaccharides are glucose, galactose.

Disaccharides are common table sugar, sucrose, maltose, lactose  

7 0
3 years ago
2. What is the role of the following components in maintaining homeostasis:<br> (b) Control center:
marin [14]

Answer:

To maintain homeostasis, the control center responds to the changes in the stimulus received from the sensor by sending signals to effectors

8 0
1 year ago
Green and brown algae share many common features. Both have pigments for trapping sunlight and use photosynthesis for energy. Bo
Lady bird [3.3K]
It will  be convergent i hoped this help you have a nice day <3

6 0
3 years ago
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