20. the model of the universe that suggests that the sun is the center of the universe was first brought by
a. copernicus.
b. brahe.
c. ptolemy.
d. kepler.

Iwill give brainliest if you answer right : )

Carbon 14 is a naturally occurring stable

The california mussel (mytilus californianus) attaches itself to a rock or other solid surface with a bundle of filaments known as the byssus. imagine that 15.0 j of work is done to stretch the distal end of the byssus. it releases 10.8 j of thermal energy as it relaxes. what is the resilience of the distal end of the byssus?