If the half-life of a radioactive isotope is 5,000 years, how many grams of the radioactive isotope in a specimen will be left after 10,000 years if you start off with 100 grams of the radioactive isotope?

F. Why are there more producers in the world than top carnivores?

A potted plant is wilting but is otherwise healthy with change at the cellular level explains why the plant is wilting

Which plate boundary is responsible for the formation of Ocean Trenches, Mountains and Volcanoes? A) A B) B C) C D) All of the above

Why can gel electrophoresis separate DNA fragments? O A. DNA fragments are positively charged. O O B. DNA fragments are negatively charged. C. DNA fragments are all the same size. D. DNA fragments are magnetic,

Choose all the answers that apply. Extinction: only happens above the species level cannot happen to more than one species at a time can be caused by habitat destruction happens when a species or population dies out

Explain the importance of regulatory mechanisms in living things. Distinguish between positive and negative feedback.

Explain some of the negative effect of climate change an how that will impact our civilization

One factor that drives atmospheric circulation is the movement of air from warm equatorial areas to cooler areas.

In a species of corn, the diploid number of chromosomes is 20. what is the number of chromosomes found in each of the normal egg cells produces by this species?

How do deciduous trees in other parts of the world most likely respond to seasonal changes?