The first person to guess my favorite avenger gets brainliest. You can only guess 2 avengers at a time

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

The covers all of earth like a thin shell,but it is not a solid sheet of material.it is broken up into several large sections and many smaller ones. fill in the blank.

Which of these is the sound of fish slapping against human flesh?