The host says that osteoblasts and osteoclasts are like “frenemies “ working closely and communicating with each other to achieve opposite actions. Where else in the human body have you seen this type of relationship

In fruit flies, gray bodies (g) are dominant over black bodies (g), and brown pigments (n) are dominant over yellow pigments (n). each individual possesses two alleles for each trait. if a fly that is homozygous dominant for both traits is crossed with a fly that is homozygous recessive for both traits, what is the predicted genotype of the offspring.

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?