<span>They are directly and forcefully affected every day by their natural environment. Typically, the first thing they do when they step outside early in the morning is to look for sign of a rain cloud. Rainfall or the lack of it, the weather cold or hot, the availability of water are concerns with which they must deal day by day, year by year.
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Answer:
The correct answer is- phosphorus and sulfur
Explanation:
Hershey and Chase used radioactive phosphorus and sulfur to label T2 bacteriophage. Then they infected E.coli with these bacteriophage labeled with radioactive phosphorus and sulfur.
After infection, they centrifuge the cell and found that radioactive phosphorus is present in the bottom and radioactive sulfur in supernatant . As sulfur is mostly the part of protein not DNA and is found in supernatant and phosphorus is mostly present in DNA not protein which was found in cell debris, therefore, it was proved that DNA is the genetic material.
Answer:
A species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.
Explanation:
.Some examples : Sea Otter. The sea otter (shown below) is considered a keystone species as their consumption of sea urchins, preventing the destruction of kelp forests caused by the sea urchin population. ...
.Large Mammalian Predators. ...
.Sea Star
The pH scale is a measurement system that indicates the concentration of HYDROGEN IONS in a solution.
The pH scale ranges from zero to 14. A pH that is less than 7 is considered to be acidic while a pH that is more than 7 is considered to be basic. pH 7 is considered to be neutral. The pH of a substance is dependent on the number of hydrogen ions that are present in the substance.
Answer:#2 ia chloroplasts #3 is no
Explanation: