If an organism of unknown genotype is crossed with a homozygous recessive organism
and half of the offspring show the dominant phenotype and the other half of the
offspring show the recessive phenotype, then the unknown genotype must be:
• O A. homozygous.
.
B. recessive.
.
C. dominant.
.
D. heterozygous.

compost can be added to topsoil as a:

pesticide

light dependent reactions:

light independent reactions:

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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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