Substances which are important in various cell processes and help in recovering and/or preventing dehydration is .

Ahypothesis that has been tested again and again , with similar results each time may become a law , true or false

Where do homologous chromosomes exchange genetic material through crossing over?               a.  chlorophyll    b.  centrosomes    c.  centromeres    d.  chiasma

How does human environment effect the biosphere