Which supports the hypothesis that life has changed over time?
a. the length of a giraffe's neck is longer than those in generations of the past.
b. organisms differ from each other around the world.
c. prokaryotic and eukaryotic cells differ in that both do not have a nucleus.
d. the atmosphere from today and years ago is different.

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Approximately 90% of all cases of polycystic kidney disease are inherited in an autosomal dominant fashion. the disease is typically related to mutations to genes (pkd1 and pkd2). pkd genes can be found on chromosome 16. the disease occurs in approximately 1: 800 to 1: 1000 people. here is a hypothetical example. the dominant allele d will cause the development of pkd. the recessive allele is known as d. what genotypes would correspond to suffering from pkd? dd, dd what genotypes would correspond to being normal (not suffering from pkd)? dd consider that 1: 1,000 people have pkd in your population of 325million. consider that pkd is inherited in an autosomal dominant fashion. show you math for all of the following questions: what is the genotypic frequency for dd? what is the genotypic frequency for dd? what is the genotypic frequency for dd? what is p? what is q? how many people in your population would have pkd?

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days. true or false