Blood has traveled from the heart to the toes. which describes the next step of the circulation process? PLEASE EXPLAIN WHY WITH FACTS PLEASE

A the blood releases carbon-dioxide on the way back to the heart.

B the blood travels back to the heart in a vein

C the blood goes through the liver to be cleaned

D the blood travels to the lungs to get oxygen

Areal dna molecule consists of thousands of these pairs of nucleotides. what is the pairing arrangement of the nitrogen bases

How dose plate tectonics effect climate

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.