Osteoblasts a) break down bone b) secrete osteoid c) form skeletal cartilage

When analyzing tree rings, what do scientists assume a thin ring indicates?

10 points a population of mice have tails. over time those mice with either really short tails or really long tails have a higher rate of survival. this will probably lead to what type of selection? a. disruptiveb. directionalc. stabilizingd. evological

Which three substances make up each of the smaller molecules that form proteins