Which level of ecology focuses on energy flow and nutrient cycling?

which air balloon has largest volume under constant pressure and temperature ?

Ultraviolet (uv) radiation is considered harmful. This can be explained by 

Energy and frequency are directly proportional. Which of the following statements is/are TRUE?

Which of the following describes a covalent bonding ?

The following are the type (shape) of atomic orbitals EXCEPT

Write the ground state electronic configuration of an element designated as X with 23 protons and 23 electrons.  Do not use shortcut (with the noble gas notation). You can write it in your scratch work.

The electrons in an atom are held and are attracted to the _____

Calculate the volume of 0.25 moles of CO2 gas at STP. Keep in mind what STP stands for.  Show your solution in your scratch paper that needs to be uploaded. No solution no points. Observe significant figure rules and unit.

The number of valence electrons N atom has is