Crossing over does helps in genetic diversity as it provides with new genes combinations. In crossing over, chromatids exchange genetic information during the meiosis. This mixing of genetic information provides the offspring with its own unique genetic makeup with some similarities with the parent’s genetic system. Crossing over is very beneficial in terms of giving the offspring more variability that helps in becoming more resistant to a disease and be a better version than parents.
Https://www.ncbi.nlm.nih.gov/books/NBK10039/
I mean the nervous system is the one that feels the pain so...
Answer:
Igneous rocks and Metamorphic rocks determine the age of the earth.
Keystone species, they kinda hold the food webs together
