B. some species die out when environmental changes occur
Erythrocytes, neurons, skeletal cells, and columnar cells are examples of: specialized cells.
Biology is the study (2) of life (1)
Relative dating best helps determine fossil age. It's where layers of sedimentary rock and fossils pile up on top of each other; the oldest fossils being in the bottom layer and the youngest in the top.
It was an asteroid that came to earth two billions years ago and scientists says that there might be another one coming.so we might live in space for a couple of months or years. so that why the dinosaur die.
