4. The graph shows the number of taxa of reptiles whose fossilized tracks have been found. which statement is best supported by these data?

What must be done to breed dogs for a partical trait

What determines whether a particular cell is able to respond to a hormone?

An adult inhales about 6.0×10−4 m3 of fresh air during a breath. only 20% of fresh air is oxygen. assume the pressure in the lungs is 1.0×105 paand the air is at a temperature of 300 k. how many oxygen molecules are in each breath? a. 1.4x10^23 b. 2.9x10^21 c. 4.9x10^-4 d. 2.9 x10^25