What is artificial selection? A. When a new allele is formed by mutation
B. When humans breed an animal for a certain trait
C. When extreme traits are selected by nature
D. When 60 percent of a species dies at one time

How many copies of each chromosomes should be present in each of the 4 final haploid versions of gamete?

Ascientist discovers a new body between the orbit of neptune and the kuiper belt. the object is round and travels in an orbit around neptune with other space objects. the scientist claims that she has found a new dwarf planet. where is the scientist’s error?

Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.