Answer the following question given this paragraph: A molecule is any combination of two or more atoms. The oxygen in the air we breathe is two oxygen atoms connected by a chemical bond to form O 2 , or molecular oxygen. A carbon dioxide molecule is a combination of one carbon atom and two oxygen atoms, CO 2 . Because carbon dioxide includes two different elements, it is a compound as well as a molecule. Q: What term is used for any combination of two or more atoms? Choices: - element - synthesis - nucleus - molecule A:
molecule
(Question)
Answer the following question given this paragraph: For photosynthesis, stomata must control the transpiration of water vapor and the exchange of carbon dioxide and oxygen. Stomata are flanked by guard cells that swell or shrink by taking in or losing water through osmosis. When they do, they open or close the stomata. Q: Stomata must control the transpiration of water vapor and the exchange of carbon dioxide and oxygen that take place during what process? Choices: - glycolysis - spermatogenesis - fertilization - photosynthesis A:
(Answer)
photosynthesis
Ques: Answer the following question given this paragraph: A chemical reaction is a process in which some substances change into different substances. In a chemical reaction, bonds break in reactants and new bonds form in products. Q: What is a process in which some substances change into different substances? Choices: - a toxic reaction - a bio reaction - a thermodynamic reaction - a chemical reaction A:
Ans: a chemical reaction
(Q).
Answer the following question given this paragraph: When a blood vessel constricts, less blood can flow through it. Q: Does blood flow increase or decrease when blood vessels constrict? Choices: - it's not affected - increases - it stops - decrease A:
(A).
decrease
Ques:Answer the following question given this paragraph: Felsic lavas are more viscous and erupt explosively or do not erupt. Mafic lavas are less viscous and erupt effusively. Q: Which type of lava lavas are less viscous and erupt effusively? Choices: - Ultramafic lava - Intermediate lava - Felsic lava - mafic A:

Ans:mafic
Answer the following question given this paragraph: 31.3 Nutritional Adaptations of Plants Atmospheric nitrogen is the largest pool of available nitrogen in terrestrial ecosystems. However, plants cannot use this nitrogen because they do not have the necessary enzymes. Biological nitrogen fixation (BNF) is the conversion of atmospheric nitrogen to ammonia. The most important source of BNF is the symbiotic interaction between soil bacteria and legumes. The bacteria form nodules on the legume's roots in which nitrogen fixation takes place. Fungi form symbiotic associations (mycorrhizae) with plants, becoming integrated into the physical structure of the root. Through mycorrhization, the plant obtains minerals from the soil and the fungus obtains photosynthate from the plant root. Ectomycorrhizae form an extensive dense sheath around the root, while endomycorrhizae are embedded within the root tissue. Some plantsparasites, saprophytes, symbionts, epiphytes, and insectivoreshave evolved adaptations to obtain their organic or mineral nutrition from various sources. Q: What process refers to the conversion of atmospheric nitrogen to ammonia? Choices: - biological nutrient fixation - biological ammonia fixation - biological respiratory fixation - biological nitrogen fixation A:
biological nitrogen fixation