All vertebrate embryos have a notochord, or a long rod that runs through the body just below the nerve cord. As the embryo develops, only jawless fish retain the notochord. What does this indicate about the evolution of vertebrates?

What ethical issues arise in the conversations about cloning? What is the primary argument used by those who advocate human cloning? Is organ cloning considered acceptable? What are some of the problems encountered in animal cloning?

Which is NOT a characteristic of a gymnosperm? A. seeds not enclosed in fruit B. seeds enclosed in fruit C. cones D. needle-like leaves

What is the significance of chitin in arthropods? A. Chitin is a storage carbohydrate that forms their exoskeleton. B. Chitin is a structural carbohydrate that forms their exoskeleton. C. Chitin is a protein that forms their exoskeleton.

How genetic variations in a population increase some individual's probability of surviving and reproducing in a specific environment

What is a earbuds inside your ear

Which characteristics work well in a dichotomous key? a) smooth or rough b) green or round c) triangle or purple d) tall or bumpy

Which of the following is a characteristic that could be applied to both living and nonliving things

What is wrong with the cellular respiration equation?

What is involved in the synthesis of a new molecule?

As rescuers in a population becomes less available. the population