Organic material in soil contains a substance called "humus". Humus is defined as A. dark organic matter that forms from sand
B. dark organic matter that forms from granite
C. dark organic matter that forms when plants and animals decay

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

post-impressionism is a predominantly french art movement that developed roughly between 1886 and 1905, from the last impressionist exhibition to the birth of fauvism. post-impressionism emerged as a reaction against impressionists' concern for the naturalistic depiction of light and colour.

explanation:

what bodys are there orbiting?