1. When is it summer in the Northern Hemisphere?

when neither pole is receiving the most direct sunlight

during an equinox

when the Northern Hemisphere is closest to the sun

when the Northern Hemisphere is tilted toward the sun

Idenifacation of each cell type as a prokaryotic or eukaryotic

What was charles darwin breakthough

If a person weighs 80kg, how many mg of H2S would it take to cause eye xirritation to begin?

Which statements best describe the first stage of cellular respiration? Check all that apply

A geneticist analyzes the four products of a meiosis for an Aa Bb plant and finds that two of the products have the AB alleles and the other two products have the ab alleles.

If there are 50 kcal of energy in the tertiary consumer trophic level, how many kcal would you expect to find in the primary consumer level

The plasma membranes of some plant cells use transport proteins to move protons out of the cell against their concentration gradient (from areas of low proton concentration to areas of high proton concentration). this is an example of:

What is algae? and where is come from?

Are mushrooms biotic or abiotic

What type of blood vessels join arteries to veins