What is stimuli in biology in terms of igcse

The table below shows the number of foot bones in some horse fossils.horse fossil recordhorse fossil number of foot bonesp 19q 17r 24s 13ancient horses had more bones in their foot then present-day horses. the present-day horse has 11 foot bones. what is the correct order of evolution of the horse starting from the youngest fossil? a. q p r s b. s r p q c. s q p r d. r p q s

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

In this experiment, the was intentionally manipulated. it is the independent variable. the dependent variables that were measured were the