Some bacteria live in the human digestive tract. Here bacteria finds a good environment to obtain nutrients. Humans improve the health of their digestive tract due to the presence of this bacteria
A. predation
B. commensalism
C. parasitism
D. mutualism

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

Awire-hair terrier and a smooth-hair terrier are mated. the offspring produced are 6 wire-hair puppies and 2 smooth-hair puppies. a. what pattern of inheritance best describes this situation? b. what is the genotype(s) of the wire-haired puppies? of the smooth-haired puppies? c. what would be the expected genotype and phenotype ratios of a mating between 2 wire-haired terriers that are heterozygous?