Where do light-dependent reactions occur?

a. the stroma

b. the thylakoids

c. chlorophyll

d. ferredoxin

What are the importance of the elements which are in plants & animals?

Hair is produced at the base of hair follicles from columns of cells that die when they are filled with keratin. True or false? Which of the following is not made up of keratin? a. fingernails c. sweat glands b. hair d. epidermis

Which is a positive effect of the technological advance of going from a compass to a GPS? A. The GPS gives more accurate information. B. The GPS is less expensive. C. The GPS is easier to manufacture. D. The GPS uses less electricity.

What are 2 ways cells are different

When the DNA molecule folds, coils and super coils to fit in the cell what structure does it form? A. Chromosomes B. Gene C. Double helix D. Single helix

There could be many possible interpretations of what surrounds you in the natural world. O True O False

What is the only item that can be reused in a self-service situation? Select one: a. Beverage Cups b. Utensils c. Straws d. Plates

A scientist begins working by trying to explain a natural occurence that is

Which label belongs in the area marked x?

Which of the following may happen to astronauts when they return to Earth from space? They may feel dizzy because the flow of blood to and from the heart to the brain is affected in space.