1. Living things
are
with each other
and the
environment.

Living things  are  interdependent with each other  and the  environment.

Explanation:

Living things to grow, thrive, survive and reproduce are interdependent on each other and their surrounding environment. They depend on each other and the environment for basic requirements which support life like water, air, food etc.

The food cycle starting with the producers, consumers, decomposers and their interdependence with each other for energy production is a clear example for this.  They are dependent on each other for reproduction and growth. They are dependent on the environment for living in their habitat and for raw materials for producing food.

particle   p is an electron and particle q is a neutron

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error