A normal range in adults is generally considered to be 4.35 to 5.65 million red blood cells per microliter (mcL) of blood for men and 3.92 to 5.13 million red blood cells per mcL of blood for women. In children, the threshold for high red blood cell count varies with age and sex.
Answer:
А. They belong to the same group of the periodic table.
Explanation:
Two elements possess similar chemical properties if they belong to the same group on the periodic table.
What determines the chemical properties of elements;
→ the number of valence electrons an element contains determines its chemical properties.
- On the periodic table, groups are vertical arrangement of elements.
- Periodic groups classifies elements into groups based on the number of valence electrons they contain.
- So, elements in the same group will have the same number of valence electrons and hence similar chemical properties.
Ability to synthesize food itself. e. g. plants photosynthesize to produce glucose.
heteroptrophic humans like us have to consume other living organisms in order to obtain nutrients for energy.
