1. Do some research into thornless varieties of plants. a. What plants are available which do not have thorns?
b. Is thornlessness a mutation?
c. When and where was the possibility of growing thornless varieties of plants discovered?
d. How do these varieties compare with the variety that has thorns?
e. Consult seed catalogs, gardening books, and magazines in the library.

How does a large body of water, such as the ocean, influence climate?

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?