What is a nebula?

•the core of a massive star

•a cloud of gas and dust in space

•a swirling disk with a lot of gravity

•the debris remaining after a supernova

A small group of neurons working together forms: a: the brain b: nervous tissue c: the spinal cord d: a single nerve cell e: the entire nervous system

Decaying plants add carbon to the soil

How cladograms provide reliable information about the evolution of organisms based on adaptions

Natural gas is very common in the United States. Natural gas forms in processes taking thousands of years. So, Natural gas is

In the bed or on the bed? give your reasons.

Erosion occurs naturally but can be made worse by human activities. What types of human activities worsen the rate of soil erosion?

What does rotting and burning biomass emit?

The figure shows a classic experiment that demonstrates the principle of osmosis. The left side of the U-tube is filled half-way with 10% red sugar water.

Rna polymerases join nucleotides through what kind of bond?

Which is NOT a function of the human stomach? A) stores food for short period of time B) breaks up food physically and chemically C) receives food from your mouth directly after swallowing D) HCl produced inside the stomach to aid in digestion