Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air) .
Answer:
The same
Explanation:
Half life is the time taken for the number of atoms in a radioactive sample to decrease to half of the initial number of atoms. It is also the time taken for the activity of a radioactive sample to decrease to half of its original value.
If samples A and B were obtained from the same rock, then they contain the same number of atoms having the same initial activity even though the samples were not prepared in the same way for analysis.
Hence, samples A and B have the same half life.
<h2>Sterilization techniques</h2>
Explanation:
(C) Place all materials in a biohazard bag and autoclave the bag.
Firstly,Autoclaving is a wet sterilization method. In an autoclave laboratory materials can be sterilized at a temperature of 120 degree Celsius under 2 atm pressure. Under these condition no cell could survive. Secondly bio-hazard bags are designed specially so that they could prevent the leak of such bio-hazards. So, to dispose off such pathogenic organism by placing the petridishes in bio-hazard bag and autoclaving will be the best method.
The given question is incomplete, the complete question is attached in the image format with the answer:
Answer:
1. aspartic acid :
asparagine
methionine
lysine
threonine
2.glutamic acid :
glutamine
proline
arginine
ornithine
3. pyruvic acid :
alanine
valine
leucine
isoleucine
4. chorismic acid :
phenylalanine
tyrosine
trypthophan
5. serine :
cysterine
glycine.
