Which structure of the excretory system mainly functions in filtration? W and X
W and Z
X and Y
Y and Z
btw thank u sm

i believe the answer is a or 1

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

the answer is: metamorphic rocks often show the presence of fossils, also a

hope i

-lavira: )