Which of the following is a remnant of a supernova?
a. neutron star
b. protostar
c. black dwarf
d. red giant

World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course. a. 12.5m/s b. 1.33m/s c. 13.3m/s d. 1.25m/s

What was the purpose of mendel's experiments with dihybrid crosses? a. to determine if dna was a transforming factor b. to determine if traits could be recessive c. to determine if traits affected each other d. to determine if traits had more than one allele

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above