Which describes a difference between birds and mammals? Birds protect and feed their young
O Birds have nearly hollow bones,
O Birds undergo internal fertilization,
O Birds efficiently transport oxygen to cells,

The distribution of related animals and plants across the world

What was the purpose of mendel's experiments with dihybrid crosses? a. to determine if dna was a transforming factor b. to determine if traits could be recessive c. to determine if traits affected each other d. to determine if traits had more than one allele

The picture represents a structure of the respiratory system. which is the function of this structure? to bring air into the body to exchange oxygen with carbon dioxide to carry air to the lungs to release oxygen from the body