The bones of this pterosaur were studied for carbon-14 levels was 1/4 the original amount. If carbon-14 has a half life of 10,000 years, how old are these specimen?

What is a soil horizon? Question 13 options: soil that is still mostly rock material bare soil from which all vegetation has been removed a layer of soil with characteristic properties a pictorial view of soil showing its ecosystem

Species are disappearing almost a thousand times faster than they are forming. What is the main cause? reproductive isolation continental drift natural disasters human impact

Describe the function of a vesicle

What is uncontrolled Chain Reaction called

What happens to biological productivity in areas where two major currents meet?

Describe how human activities threaten polar bears in the arctic

What did Mendel cross pollination of pea plants prove

Which type of rock is created when lava cools and hardens? A. igneous B. sedimentary C. metamorphic D. cement

Name 2 ways the diffusion of popular customs can adversely affect the environment

Once your ambulance is dispatched to an emergency, you have an obligation to respond. what is this called?