Answer:
The pericardium is the most outer layer of the heart. Main function to protect the heart from external forces/entry.
Crossing over, or recombination is the exchange of chromosome segments between non sister chromatids in meiosis. Crossing over creates new combinations of genes in the gametes that are not found in either parent, contributing to genetic diversity.
When molecules are being transported opposite to the molecules concentration gradient.
Hope i helped!
