Scientists do not know the exact cause of sexual orientation, but they believe that it is caused by a complex interplay of genetic, hormonal, and environmental influences. They favor biologically-based theories, which point to genetic factors, the early uterine environment, both, or the inclusion of genetic and social factors. There is no substantive evidence which suggests parenting or early childhood experiences play a role when it comes to sexual orientation. Research over several decades has demonstrated that sexual orientation ranges along a continuum, from exclusive attraction to the opposite sex to exclusive attraction to the same sex.
Do scientist's know what can cause somebodys sexual orientation?
Scientists do not know the exact cause of sexual orientation

In recent years, Melton, Wyndham and Casey, part of the Melbourne statistical division, have recorded the highest growth rate of all local government areas in Australia. Melbourne could overtake Sydney in population by 2028, The ABS has projected in two scenarios that Sydney will remain larger than Melbourne beyond 2056, albeit by a margin of less than 3% compared to a margin of 12% today. Melbourne's population could overtake that of Sydney by 2037 or 2039, according to the first scenario projected by the ABS; primarily due to larger levels of internal migration losses assumed for Sydney. Another study claims that Melbourne will surpass Sydney in population by 2040.
In how many scenarios will Sydney remain higher than Melbourne in population beyond 2056?
two

Ramanuja (c. 1037–1137) was the foremost proponent of the philosophy of Viśiṣṭādvaita or qualified non-dualism. Viśiṣṭādvaita advocated the concept of a Supreme Being with essential qualities or attributes. Viśiṣṭādvaitins argued against the Advaitin conception of Brahman as an impersonal empty oneness. They saw Brahman as an eternal oneness, but also as the source of all creation, which was omnipresent and actively involved in existence. To them the sense of subject-object perception was illusory and a sign of ignorance. However, the individual's sense of self was not a complete illusion since it was derived from the universal beingness that is Brahman. Ramanuja saw Vishnu as a personification of Brahman.
For the existence of what did the Visistadvaita philosophy argue?
Supreme Being