Can someone ? ? < 3

a person has a sex-linked inheritable disease. which statement is true about the set of chromosomes which are likely to carry the genes for this disease?

the gene is present on a single pair of chromosomes.
the gene is present multiple pairs of chromosomes.
the gene is always present on an x chromosome.
the gene is always present on a y chromosome.

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

Residential construction is expanding in florida, the expansion has caused fragmentation of habitats, one of the results of the increased construction is a decrease in the number of large predators such as the coyote, black bear and pool panther, which will be the most immediate local result of this fragmentation? 1)large predators will become extinct 2)decrease in middle sized predators 3)increase in population of top carnivores 4)increase in population of prey species

Why do mountaineers become breathless as they reach high altitudes