Color blindness is a recessive trait. the gene for color blindness is on the x- chromosome. the family tree below shows the trait of color blindness. the only unknown is the mother in the first generation. to what must be true about the mother? o a. she has at least one recessive color blindness allele. o b. she only has one x chromosome. o c. she is color-blind, o d. she has two recessive color blindness alleles.

The image shows embryos of three vertebrate classes

Darrel conducted an experiment with the following procedure: fill two cups with ice water. place an uninflated balloon snuggly onto your left index finger. blow a little air into an identical balloon, and place it onto your right index finger. place both fingers into the cups of ice water. darrel noticed that his right finger felt warmer in the ice water than did his left finger. which of the following does the experiment show? a. air is a good radiator of heat. b. air is a good insulator of heat. c. air is a good conductor of heat. d. air is a good convector of heat.

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.