Cactus species have evolved to cope with hot dessert habitats by storing large amounts of water and growing spines instead of leaves. This reduces the plants surface area and minimizes the amount of water that is lost through evaporation. 2) The trait of spines on cacti: (1) Appeared in ancestral cacti because they lived in deserts and needed spines to reduce water loss Appeared in cacti because of a chance mutation. a) Only the top statement is correct. b) Only the bottom statement is correct. c) Both statements are correct. d) Neither statement is correct. (1I)

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QUESTION:- Community A receives its water from several sources. The water source responsible for causing an outbreak of disease X is unknown. The best evidence to determine which suspected water supply is responsible would be: Question 19 options: a.  the identity of the water supply providing water to the largest proportion of cases. b.  the relationship between quantity of water consumed and the severity of attack for each individual. c.  the identity of the water supply that has the greatest opportunity for contamination during the epidemic. d.  the attack rates for disease X in those who did and did not drink from each water supply.

i need an abstract style (something you would submit to an academic conference) summary/introduction/presentation of this case study?