Difference between RBC and WBC

Answer

RBC / Erythrocyte:

1. They are red color  due to presence of haemoglobin.

2. They are smaller in size (7.5µ), biconcave and non-nucleated

3. They are immobile.

4. They are produced in red bone marrow.

5. They transport oxygen and carbon dioxide

WBC / :Leukocyte

1. They are colourless due to absence of haemoglobin

2. They are larger in size (15µ) irregular and nucleated.

3. They leave the blood vessels and move to the injury site (diapedesis).

4. They are produced in lymph nodes, spleen, etc

5. They defend the body from attack of germs.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".