David was studying for his chemistry exam. To understand the elements of the periodic table better he categorized them into three groups, cat A, cat B, and cat C. In cat A he placed all the elements with atomic numbers lower than 83. In cat B he put the elements with atomic numbers from 83 to 94. Finally, in cat C he placed the elements with atomic numbers over 94. He found it easier to see their differences after he categorized them. Which category would less likely show radioactive decay, cat A or cat B?
----
Answer: cat A

Two groups of students learned about protozoa for a school project. Group P studied more about predatory protozoa, while group G studied about grazing and parasitic protozoa, plus portozoa as food sources. Which group learned less about protozoa preying on bacteria?
----
Answer: group G

Two different countries have different approaches to milk production. Austria produced organic milk, while Hungary produced conventional milk. Which country reduced leaching of phosphates from farms?
----
Answer:
Austria