What is the role of teeth digestion

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

What molecules does hemoglobin decay into over time

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits