Element z has two naturally occurring isotopes. Its first isotope has a mass of 28. 0 amu and a natural abundance of 64. 24%. Its second isotope has a mass of 25. 0 amu. What is the average atomic mass of element z?

Panthers and leopards prey on deer in an ecosystem. for unknown reasons, the population of leopards increased drastically. what are the likely effects of this change on the species? 1. more food for panthers and more competition for leopards 2. less food and more competition for panthers 3. fewer deer and more competition for panthers 4. more food for deer and less competition for panthers and leopards 5. more food for leopards and less competition for panthers