How might a problem in Lucille’s respiratory system or circulatory system make it difficult for Lucille to play soccer?

Although there are a limited number of amino acids many different types of proteins exist because..

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

Explain how scientists use geologic time to determine the age of landforms.