LET: Science Part 5

SCIENCE Part 5 1.It is an iron sulfide with the chemical formula FeS2 and is considered the most common of the sulfide minerals. a. pyrite b. granite c. bronze d. quartz answer: a 2. Any one of a large group of animals such as snails and clams that have a soft body without a backbone […]

LET: Science Part 4

SCIENCE Part 4 1. This is the lower plant portion, usually a healthy root system and some portion of the stem used in grafting. a. stamen b. pistil c. roostock d. trunk answer: c 2. In grafting, this is the portion above the graft, a young shoot or bud from a plant with beneficial characteristics […]

LET: Science Part 2

SCIENCE Part 2 1.It is a molecule that carries the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses. a. ribonucleic acid b. proteins c. lipids d. DNA answer: d 2. The outer layer of the skin which provides a barrier to infection from environmental pathogens. […]