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Brut [27]
3 years ago
15

What are the types of stem cells?

Biology
2 answers:
vredina [299]3 years ago
6 0
The two main stem cell types are embryonic stem cells and adult stem cells. 
Nikolay [14]3 years ago
3 0
Embryonic stem cells,
Tissue-specific stem cells.
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How specifies that are separated for a river, rocks, mountains, forest ; can at some point not being able to interbreed anymore
Allushta [10]

Answer:

Species separated by a physical barrier for a long time, suffer allopatric speciation, so they can not interbreed anymore.

Explanation:

Allopatric speciation consists of the geographic separation of a continuous genetic background giving place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flow, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.

Vicariance is the geographical separation of an original population into two or more new groups. Discontinuities in the physical environment like rivers, mountains, water, etc., are physical barriers that impede genetic flow between the separated groups.

The process of allopatric speciation involves different steps:  

  1. The emergence of the barrier.  
  2. Interruption in the genetic interchange
  3. The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation.
  4. Genetic divergence by natural selection and reproductive isolation makes it impossible for the two groups to mate even if the barrier disappears.  
  5. Prezigotic isolation mechanisms favored by selection once occurs a secondary contact between the new species in formation.

8 0
2 years ago
if the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal
kodGreya [7K]

Answer:

At 0 years, an event took place which is known as metamorphosis of igneous rock i.e., formation of igneous rocks from melted magma.

Strontium-90 is a radioactive element which undergoes beta decay to form yttrium-90. It has a half life of approximately 28 years and decay energy of 0.546 MeV. This radioactivity is used by geologist to estimate the age of the rock, fossils, meteorites etc. Other radioactive elements used by the geologists are carbon-40, potassium-40 etc.

Radiometric clock is set when the rock was formed in the past i.e., the moment when an ingenious rock was solidified from molten magma.

7 0
3 years ago
Read 2 more answers
Describe the role of producers in a food web. Are producers the basis of all food webs? Justify your answer. please help me!!!
Thepotemich [5.8K]

Answer:

The producers play main role in the food chain and food web as well. These organism make food by the help of the process known as photosynthesis.

Only producers have the ability to make food by trapping sunlight. All the living source needs energy to survive.

The source of food is producers so living things cannot survive without food. So there producers are considered as the main component of food chains and food web.

hence, they play a very vital role in the environment.

6 0
3 years ago
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What are the nitrogenous bases found in dna?
REY [17]
<span> Adenine, Guanine, Thymine, and Cytosine :)</span>
6 0
3 years ago
Use the drop-down menus to complete the statement.
Elanso [62]

Answer: the first one is armature and the second one is pole

3 0
3 years ago
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