Which trem are used to identify pure substances?
a) an element and mixture
b) an element and compound
c) a solution and a mixture
d) a solution and a compound

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.

How does friction with the atmosphere affect the speed of an artificial satellite

Based on the law of dominance, we would expect percent of the offspring from this cross to have large teeth.