The earth is populated mostly by single-celled organisms, such as bacteria. however, there are many multi-celled organisms as well. which of the following is a multi-celled organism? a. insect b. human c. flower d. all of these

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?