D) differences between species and their ancestors
This is because of the adaptive mechanism and mutations the organisms have to respond to. <span>Adaptation processes occur to help species survive and thrive in the ecological balance of life. Structural adaptations are physical features of an organism that adapted through time. An example of this are the bills of a bird and the fur of bears that they generally need for their survival; birds for hunting, and bears to protect them from low climate areas.</span>
The sled with a rough metal bottom would take more force to move over ice, because the rough surface would increase friction and the force needed.
Answer:
A. ovary
Explanation:
It takes place in a fallopian tube that links an ovary to the uterus.
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This is called homeostasis
DNA replication occurs due to an enzyme. The DNA unzips, and the enzyme pieces together new parts to make each half its own full DNA strand.