It is possible to date the rocks by comparing the amount of specific radioactive isotopes they contain. Which of the statement is correct in this respect?

8 years ago

A. Older sediment layers have equal amount of these radioactive isotopes as that of the young ones B. Older sediment…

Normally, in the process of osmosis, the net flow of water molecules into or out of the cell depends upon differences in the ?

8 years ago

A. Concentration of water molecules inside and outside the cell B. Concentration of enzymes on either side of the cell…

Most cell membranes are composed principally of ?

8 years ago

A. DNA ad protein B. Protein and Lipids C. Protein and Chitin D. Protein and RNA

A large regional community primarily determined by climate is called ?

8 years ago

A. Population B. Community C. Biome D. Habitat

The evaporative cooling in the respiratory tract of dogs is called?

8 years ago

A. Vasodilation B. Vasoconstriction C. Panting D. All of these