What property does frozen water have that might be useful in searching for other planets with frozen poles?

Anybody who knows ap biology, can you friend or message me

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.

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a