*Question*
You are presented with the question "What in soil converts atmospheric nitrogen into a form usable by plants?" and the following answer choices: - compound of hydrogen oxygen - carbohydrates - single-celled organisms - excretory structures - peachleaf willow - members of their own species - It helps them survive - deoxyribonucleic acid Now knowing that bacteria in soil convert atmospheric nitrogen into a form usable by plants and bacteria are single-celled organisms, choose the best answer.
**Answer**
single-celled organisms

*Question*
You are presented with the question "Most of the universe is composed of what separated from atoms in stars?" and the following answer choices: - energy - Joules - nucleus - matter - oxygen - RNA - atoms - Energy. Now knowing that plasma is formed by electrons separating from atoms in stars and most of the universe is in the plasma state, choose the best answer.
**Answer**
atoms

*Question*
You are presented with the question "A solution is formed when limestone is dissolved in what?" and the following answer choices: - old caves - habitats - body water - rainfall - calcite - sandy shores - evaporation - ocean water Now knowing that asolution is formed by one substance being dissolved in another substance and another dissolved substance in ocean water is a type of rock called limestone , choose the best answer.
**Answer**
ocean water

*Question*
You are presented with the question "what produces a diploid zygote when fertilized?" and the following answer choices: - bamboo - eggs - sperm - pollen - brain cells - lawns - embryos - h2o Now knowing that fertilization of gametes produces a diploid zygote and male gametes are sperm, choose the best answer.
**Answer**
sperm