How can you determine the past arrangement of leaves on a bare twig?

The determination of the past arrangement of leaves from bare twig  are

Explanation:

Terminal bud:  it is the large bud at the apex of the twig.  Uses of the bud is to protect the dormant meristem.  

Bud scale: a small modified leaf on outside of bud.

Auxiliary bud: It is found just above the each leaf scar. Not all twig will have a full complementary of auxiliary buds. They frequently gets damaged.

Lenticles: Opening in the bark that allows for gas exchange into and out of underlying living tissues.  

Leaf scars: It is present at  the stem for the triangular regions.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

prothallium

explanation: