In vertebrate animals, the same organ in different species often have different structures. for example, the heart of a fish has two chambers while the heart of a mammal has four chambers. what is an explanation for these differences in organ structure? a) reproductive differences b) differences in the size of the animals c) mutation of the genes of the organisms d) adaptation of organisms to their environments

Are these strong bases, neutral, strong acids, weak acids or weak base household bleach (ph=12.6) fluid in a car's battery (ph of less than 1.0) milk (ph=6.7) stomach contents (ph=2.2) pure water (ph=7)

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

Donde se encuentra el adn nuclear en un organismo eucariota?