Answer: natural selection
A nervous system because worms don't have nerves
The Outer core is liquid and moving.
Earth's core is composed of Iron and Nickel.
Answer:
DNA tightly coils around proteins and condenses into chromosomes, which fit in the nucleus.
Explanation:
Answer:
A hammerhead shark that gave birth in a Nebraska aquarium reproduced without mating, a genetic analysis shows. This form of asexual reproduction, called parthenogenesis, has been found in other vertebrate species, including some snakes and lizards. But this is the first time it has been documented in a shark.
