Which phase in the cell cycle is hardest to identify?

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?

Advances in technology have enabled scientists and researchers to better study the evolutionary relationships between species

Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals