Planaria are flatworms that are found in shallow streams, often attached to the bottoms of
rocks. A class is studying a population of planaria in a nearby shallow stream. The graph
below shows data collected over 11 weeks.
After 5 weeks, the population decreased, and students concluded that the stream did not have
enough food to support a large population of planaria. If the trend continues, how many
planaria will be living by week 12.
A)600
B)500
C)400
D)300

Coat color in cats is determined by genes at several different loci. at one locus on the x chromosome, one allele (x ) encodes black fur and another allele (xo) encodes orange fur. females can be black (x x ), orange (xoxo), or a mixture of orange and black called tortoiseshell (x xo). males are either black (x y) or orange (xoy). bill has a female tortoiseshell cat named patches. one night, patches escapes from bill\'s house, spends the night out, and mates with a stray male. patches later gives birth to the following kittens: one orange male, one black male, two tortoiseshell females, and one orange female. what are the genotypes of patches, the stray male, and the kittens?

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

Which three statements represent the benefits of performing experiments using computer simulations?