Which of the following would be a best choice as a core for an electromagnet?

A. Plastic straw

B. Copper wire

C. Iron nail

Sediments on Earth's Surface can have a different composition than the underlying bedrock. How is this best explained

What is the major environmental factor limiting the numbers of autotrophs at great depths in the ocean

The growth rate of a population increases, the doubling time a. increasesb. decreasesc. remains the samed. depends on the amount of natural resourcese. is not related to growth rate increases

Fix the statement to make it agree A. Sulfuric acid in the stomach kills bacteria that enters your body on the food you eat

An object from space burning up as it enters the atmosphere of a planet

Photoperiodism and flowering use the data in the table below to determine whether each plant is a short-day plant, a long-day plant, a day-neutral plant, or a plant that cannot be classified based on the data. description plant a plant b

The alkali metals make up which group of the periodic table?

What is the most important mechanism through which combined oral contraceptives prevent pregnancy?

You are making CO2 production measurements on hovering hummingbirds in Peru and assume they have fed on floral nectar recently (glucose), but in fact, they have not fed in the last hour and are metabolizing fat;

C. Which specific biomolecule (lipid, protein, nucleic acid, carbohydrate) is each food mostly made of?