How can the distribution of a species be affected both by its evolutionary history and by ecological factors

Each pair of clay balls represents two planetesimals. if each planetesimal is composed of the same material and is separated he the same distance, which pair experiences the frayed gravitational attraction?

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

Long term exposure to waves can cause sunburns and skin cancer.