Choose all the answers that apply. The ionosphere .

is used to send radio waves
blocks harmful x-rays
is warmed by the ozonosphere
includes all the layers after the mesosphere
contains charge atoms

Which element is found in both dna and proteins

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

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?