Which of the following diseases is caused by a virus?
a. common cold
b. athlete’s foot
c. african sleeping sickness
d. tuberculosis

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

Aragonite shells of clams, snails, or scleractinian corals may be preserved unaltered in cenozoic deposits, but they are generally dissolved or recrystallized in older deposits. true or false

Kinases add - groups to other enzymes. this activities some enzyme while inhibiting other