Suppose a fern fossil is found between layer Y and layer z during which time range with fern fossil most likely have formed? A.2-10 million years ago
B.10-30 million years ago
C.30-50 million years ago
D.50-70 million years ago

The galapagos island contain 13 species of finches four of the species are seen here it is believed that all of the species had one common ancestor and overtime

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above