Select the correct answer. In this drawing, which layer of rock is the oldest?

a diagram showing six layers of rock with a low wall or fence cutting through them;
layer 1: trilobite
layer 2: ammonite;
layer 5: plant;
layer 6: trilobite and armored fish

A.
layer 1
B.
layer 2
C.
layer 5
D.
layer 6

Plz me ! 1 which of earths spheres contains most of its mass? a atmosphere b hydrosphere c geosphere* d biosphere 2 erosion and weathering are examples of which types of forces? a constructive forces b destructive forces* c gravitational forces d inertia-related forces 3 which of the following statements about earths atmosphere is true? a earths atmosphere contains 78% water vapor which is essentail to life b earths atmosphere contains 21% oxygen c earths atmosphere contains carbon dioxide which all life forms require d earths atmosphere allows radiation from the sun to pass through it and warm earths surface* 4 the strenght of the force of gravity between two objects is determined by which of the following factors? select all that apply a the messes of the objects* b the distance between the objects* c the volumes of the objects d the surface area of the objects 5 earth and moon are kept in there respective orbits due to the influence of a inertia b gravity c gravity and inertia* d neither gravity or inertia if you answer all questions right i will give

What are the similarities between compounds and mixtures?

Ahelium balloon contains 16.9 l of helium at stp. how many atoms of helium are in the balloon