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1.which of the following is always single stranded?
a dsrna
b dna
c mrna
d dna and rna
2 which of the following is a difference between dna and rna?
a rna has thymine
b rna contains lipids
c most types of rna are double stranded
d they have different sugars
3 which of the following bases are found in rna but not dna?
a guanine
b cytosine
c adenine
d uracil

Which medullary index indicates a human hair? a. 0.653 b. 0.733 c. 0.516 d. 0.256

Dr. kaylan is an ecologist who studies bird behavior. she sets up an experiment to test which type of food crows are most likely to eat when given a choice between walnuts, corn, and sunflower seeds. to perform her experiment, dr. kaylan places three food bins in an area frequented by cows. each bin contains one of the three food types. then, she measures how much of each food type is eaten every day for a month and summarizes the results of her experiment in the pie chart below. based on her results, dr. kaylan concludes that crows choose to eat corn more frequently than other food sources because it has a higher nutritional value. what is a reasonable alternate conclusion that can be drawn from dr. kaylan's data

Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).