Which of the following is true?
a. tardigrades can survive both extreme heat and extreme cold.
b. tardigrades can survive extreme heat, but not extreme cold.
c. tardigrades can survive extreme cold, but not extreme heat.
d. tardigrades cannot survive extreme heat or extreme cold.

The correct option is: a. Tardigrades can survive both extreme heat and extreme cold.

Explanation:

Tardigrade, also called the moss piglet or water bear, is a phylum of the most resilient micro-animals that can survive in extreme environmental conditions like dehydration, extreme pressure and temperature, radiation, and also outer space.

These micro-organisms can survive at an extremely low temperature of 1 K and extremely high temperature of about 420 K.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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