In a series of rock layers a geologist finds fossilized shellfish and bony fish in layers that are 1.0 m and 1.5 m deep. however, in a layer that is 2.0 m deep, he finds fossils of a lizard-like dinosaur and a fern-like tree.
which explains his findings?

a) the continent shifted to a polar region
b) the ancient sea dried up and became land
c) an astroid hit the area, causing the dinosaurs to become extinct
d) the ancient land area was invaded by the sea

for your time!

Imagine a person stepping on a pin and pulling his or her foot away. look at the reflex arc of this scenario below. which statement best describes the image? a)the sensory nerve carries the signal from the effector to the interneuron, and the motor neuron carries the signal to the receptor. b)the motor nerve carries the signal from the receptor to the interneuron, and the sensory neuron carries the signal to the effector. c)the sensory nerve carries the signal from the receptor to the interneuron, and the motor neuron carries the signal to the effector. d)the sensory nerve carries the signal from the receptor to the motor neuron, and the interneuron carries the signal to the effector.