Though some of the research is inconclusive, identify the findings about biological factors and their effect on sexual orientation as either true or false.
mothers who have already given birth to one boy may develop an immune reaction when pregnant with another boy, which alters the hormones in the prenatal environment.
females who were exposed to androgens while in the womb are more likely to report being lesbians.
gay men have higher levels of estrogen, and lesbian women have higher levels of testosterone.
researchers have found a single gene in humans that, when altered, causes people to reverse their sexual orientation.
there is an area of the hypothalamus that is smaller in gay men than it is in straight men.
identical twins are more likely than fraternal twins to have the same sexual orientation.

The construction of phylogenetic trees is a mapping out the proposed divisions and common ancestors of all living species. traditionally, these trees have been built using morphological data, such as appearance and embryology. recently, it has been possible to construct these trees using molecular data. phylogenetic trees based on different types of information agree with each: that there is strong evidence of a real underlying common descent. this phylogenic tree is composed based on molecular data (rrna). what statements can we infer are true about the organisms throughout the tree? because the tree is rooted, all branches share a common ancestor. all organisms have some sort of cellular structure/organization. all eukaryotes evolved from bacteria. since the organisms contain rna, they share the same dna. if the organisms contain rna, the share the same four nitrogen bases.

What kind of seafood would you expect to have the highest levels of mercury and why? kelp, because they use the sun to photosynthesize on the bottom trophic level. oysters, because they filter feed on plankton on a lower trophic level. small fish, because they eat plankton on a higher trophic level. sharks, because they feed on organisms on a higher trophic level.

Nerve cells are specialized to respond to stimulitrue or false?