The nucleus during prophase II. In Metaphase II the chromosomes line up single file down the of the cell. In the sister chromatids split up.

The nucleus is dissolved during prophase II. In metaphase II the chromosomes line up single file down the metaphase plate of the cell. In  anaphase II, the sister chromatids split up.

Explanation:

After meiosis I, meiosis II happens, which is like mitosis in the fact that sister chromatids are separated and migrate towards different daughter cells, resulting in four daughter cells with an haploid number of chromosomes.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.