B positive patients can receive blood from B positive, B negative, O positive and O negative donors.
Color I believe because if a diamond was the same color as coal(black) you couldn’t tell a difference
Answer:
Open circulatory system:
Relies on the heart to keep blood flowing
Used in all vertebrates
Sorry thats all i know :)
Well, when chromosomes cross over during prophase 1 of meiosis, the homologous pair of chromosomes exchange segments of DNA which happen to be the genes. So the significance of crossing-over during prophase 1 is that it adds genetic variation to sexually reproducing organisms.
