Which bone joins the lower end of the humerus to form the elbow joint?
a. scapula
b. carpal
c. radius
d. ulna
e. clavicle
ANSWER: d
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In the oceans, sulfur exists primarily as ________, and in rocks and sediments sulfur occurs mostly as ________ and ________
A) hydrogen sulfide (H2S) / gypsum (CaSO4) / elemental sulfur (So) B) hydrogen sulfide (H2S) / sulfate (SO42-) / elemental sulfur (So) C) sulfate (SO42-) / gypsum (CaSO4) / pyrite (FeS2) D) sulfate (SO42-) / sulfide (H2S) / elemental sulfur (So)
________ allows fish to camouflage themselves to avoid predators or ambush prey
a. Obliterative countershading b. Disruptive coloration c. Aposematic coloration d. Cryptic coloration
Which of the following hormones stimulates uterine contractions during the birth process in mammals?
A. oxytocin B. chorionic gonadotropin C. FHS D. LH E. testosterone
What are attached at the centromere?
A) Homologous chromosomes B) Sister chromatids C) Daughter cells D) Genomes