The amino acids sequences for hemoglobin in humans and gibbons differ by one amino acid. this molecular similarity in these two species indicates that a) are the same species b) were recently in the same species c) are not closely related d) share a common ancestor

What is thought to have caused the mass extinction at the end of the cretaceous period?

Looking at this image, what relationship can be drawn from it? the lower the degree of latitude, the lower the degree of temperature there is no relationship between latitude and temperature the higher the degree of latitude, the higher the degree of temperature the lower the degree of latitude, the higher the degree of temperature

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.