Helppp hurry it's a timed test

The integumentary, skeletal, and circulatory systems all play a role in protecting the body against a

In a cladogram, what occurs at a node? a derived trait appears. evolution is stopped. an ancestor dies. the cladogram ends. aa as s as ss what are the chances that their offspring will have sickle cell anemia? 0% 25% 50% 100%