Population and Resource Limitations  Directions: In the sciences we often perform what is called a back of the envelop calculation.  Let’s ask the question: Can China sustain itself if its entire population starts eating beef?  You can do this calculation quickly with only a piece of paper and Google, but […]

Question:  What were the components of the pectoral girdle in early fishes and how has it changed in tetrapods? Specifically, what is the typical fate of the coracoids and clavicle in the tetrapod girdle?Question:  What is the function of the pelvic girdle? What are the structural components?Question: What changes have occurred […]

1. Which of the following is NOT a function of meiosis? A) Gamete formationB) Maintenance of correct chromosome number following fertilizationC) Tissue renewal and repairD) Generation of genetic diversity by crossing overE) Generation of genetic diversity by random assortment of chromosomes 2. During which stage of meiosis does crossing-over occur? […]

Q. Scientists consider that photosynthesizing organisms originated in water. Before the earth had an atmosphere, water provided the only protection from harmful rays of the sun. As the organisms in the water began to produce oxygen and an atmosphere developed, it was possible for land plants to evolve. You have […]