In a study where participants rated the pleasantness of t-shirt odors, what gene alleles influenced their odor preference

Major histocompatibility complex are the gene alleles that influenced their odor preference.  

Major histocompatibility complex (MHC), are group of genes found in mammals. Major histocompatibility complex codes for proteins that are present on cells surfaces and assist the acquired immune system to recognize foreign molecules. The primary role of MHC molecules is to attach to antigens obtained from pathogens and show them on the cell surface for recognition by the suitable T-cells.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.