D goes with 2
C goes with 1
B goes with 3
A goes with 4
On farms the main sources of organic matter are plant litter (plant roots, stubble, leaves, mulch) and animal manures. Earthworms and microorganisms decompose these materials. The process of decomposition releases nutrients which can be taken up by plant roots.
Answer:
Sperms are the male gametes produced in the seminiferous tubules of the testes. The main difference between spermatogenesis and spermiogenesis is that spermatogenesis is the formation of sperm cells whereas spermiogenesis is the maturation of the spermatids into sperm cells.
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The tailbone is an example of a homologous stucture.
Answer:
phenotype is a correct answer.
Explanation:
The observable traits expressed by an organism are described as its phenotype.
Phenotype is the physical appearance of an individual, which includes individual development, behavior, and appearance.
An individual phenotype is known by its genotype ( that is a genetic identity of an organism).
Thus phenotype is desecribed as the observable appearance of an organisum which include its structure, morphology, its physiological properties and behavior.
