In which of the following is star formation most likely to occur? (I think that it's B, but I need another opinion)

A. a black hole

B. a neutron star

C. an extremely dense cloud of space dust and gas

D. a young star that has just entered the main sequence

Plz genetic engineering can be applied to many fields including medicine and agriculture. which of the following is a medical application of genetic engineering? a. giving crop plants recombinant dna so that they would be resistant to herbicides. b. examining a persons pedigree to determine whether they can carry a gene for a genetic disease. c. analyzing a persons dna to see how closely they are related to another person. d. certain genes into bacteria so that they will produce a needed medicine.

In a cross between individuals of a species of tropical fish, all of the male offspring have long tail fins, and none of the females possess the trait. mating two of the f1 fish fails to produce females with the trait. explain the inheritance pattern of the trait.

Are gametes exactly the same? explain why or why not?