Q: What is corrosive mixture is formulated by the combination of water, air and sulfur? Choices: - nitric acid - sulfuric water - hydrochloric acid - sulfuric acid A:
sulfuric acid

Q: Sperm propel themselves through secretions in the uterus and enter what tube? Choices: - gaseous - ovarian - uterine - fallopian A:
fallopian

Q: Q: What makes up the core of the endoskeleton? Choices: - dermis - notochord - thorax - vertebral column A:
A: vertebral column

Question: Q: Since europeans settled in the united states, about what percentage of topsoil has eroded away? Choices: - 42 percent - 10 percent - 25 percent - 33 percent A:
Answer: 33 percent

*Question*
Q: What consists of thylakoid membranes surrounded by stroma? Choices: - a photon - a nucleus - a stem - a chloroplast A:
**Answer**
a chloroplast

*Question*
Q: What are typically named for their major physical or climatic factors in addition to their predominant vegetation? Choices: - communities - aqueous biomes - habitats - terrestrial biomes A:
**Answer**
terrestrial biomes