The great burdock plant’s seeds have spines on them that attach to the fur of animals that brush against it. the seed then travels with the animal until it eventually falls off, which spreads the plant’s seeds farther than the plant could have done. what type of symbiotic relationship is this? . a.. mutualism. b.. commensalism. c.. parasitism. d.. competition

The answer is commensalism.

Commensalism is a relationship between two organisms in which only one of them has benefit, and the other one is not affected. In this example, the Great Burdock's plants spread their seeds using animals, so they benefit from this relationship. On the other hand, animals neither have benefits not are harmed from the relationship.
Therefore, the relationship between the Great Burdock plants and animals is the example of commensalism.

the answer to the blank provided is “an autosomal gene that is required for the expression of genes on the x chromosome”.

testis-determining factor, abbreviated as td, which is more popularly known as sex-determining region y or sry protein, is a dna-binding protein or  gene-regulatory protein/transcription factor, encoded by the  sry gene. it is the gene responsible for the initiation of male gender determination in humans.