Answer:
A) its elliptical orbit and tilt on its axis
Explanation:
Earth revolves around the sun in an elliptical path. Its axis is tilted to about 23.5° from the vertical.
These two factors determine the global climate on the Earth.
Due to elliptical orbit, the earth is sometimes closer to sun than the rest of the time. When it is closer the global temperature rises by 5 degrees. Due to the tilt of the Earth, seasons occur. The hemisphere which points towards the sun has summers where as which points away has winters.
Thus, the long-term climate change is effected by elliptical orbit and tilt of the axis.
Answer:
Commensal= mites and larger insecta who fly. Hermit crabs and shells of other organisms. Remora fish and whales. tree frogs and plants.
Parasitic= tick and dogs, tapeworm in humans, Barnacles and whales
Explanation:
Commensalism is when one species benefits and the other is neither helped or harmed. Parasitism is when one benefits and the other is harmed.
1. Populations changing over generations
2. Gradual change
3. Speciation
4. Natural selection
5. Common descent
