The human X and Y chromosomes are...
1 point
both present in every somatic cell of males and females alike.
of approximately equal size.
almost entirely homologous, despite their different names.
called "sex chromosomes" because they determine an individual's sex.
all of the above

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answer: b. nucleolus

explanation: nucleolus is a structure in the nucleus are ribosomes are made.

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-charlie

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igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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