Always 23 because 23+23 is 46 All humans have 46 chromosomes 23 from dad 23 from mom
The forensic scientist can assume that the number of adenine is always equal to the number of thymine, according to the base pair rule. Adenine matches with the other purine pair, thymine because it is the only thing to which it could have a hydrogen bond with.
Answer:
Whales = lungs
Clams = gills
Spiders = tracheal system
Answer:
One theory had been that hippos were related to pigs. Yet mounting evidence suggested they are closer to whales. A new study concludes that a four-footed semi-aquatic mammal that thrived for some 40 million years was a common ancestor to both whales and hippos.
Explanation:
c, 22,800 (4 half lifes, 1/2, 1/4, 1/8, 1/16)
