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.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o