Fact 1: Lymphocytes are the key cells involved in the immune response. Fact 2: Blymphocytes produce antibodies . Given the two facts above, answer the question "The cells that produce antibodies are key in what system?" with the following options: - health - T cells - vision - humans - macrophages - B cells - disease - immune
immune

Fact 1: Freezing causes a solid to form. Fact 2: Freezing is a physical change. Given the two facts above, answer the question "What causes solids to form?" with the following options: - Physical weathering - an external framework - Physical changes - adding sand - adding mud - heating liquids - adding water - A solid geometric shape
Physical changes

Q: Fact 1: Afirecracker converts chemical energy into sound. Fact 2: Energy is generated by sound waves. Given the two facts above, answer the question "What can convert chemical energy into audible waves?" with the following options: - a flashlight - electrically - animals - a firecracker - power stations - sensory neurons - x-ray - electrical light
A: a firecracker

Question: Fact 1: Killing microorganisms in food can be used to extend the shelf life of that food. Fact 2: Irradiation kills microorganisms that spoil food. Given the two facts above, answer the question "what can be used to extend the shelf life of food" with the following options: - Cooking - Enzymes - rays or beams - irradiation - leaving food at room temperature - Dehydration - eating food - grinding food
Answer: irradiation

*Question*
Fact 1: Cells secrete acids and bases to maintain the proper pH for enzymes to work. Fact 2: An enzyme is a biological catalyst . Given the two facts above, answer the question "Catalysts require proper what to work?" with the following options: - DNA - pH - pan - RNA - elevation - time of day - gas - humidity
**Answer**
pH

(Q).
Fact 1: Urine is the liquid waste product of the body that is excreted by the urinary system. Fact 2: Along with water, minerals are lost in the urine. Given the two facts above, answer the question "What is excreted through the urinary system?" with the following options: - glucose - matter - liquid - CO 2 - sodium - potash - sugar - water
(A).
water