Dioxin is a chemical byproduct made during manufacturing. Animal testing has shown that it can have negative effects on organisms such as birth
defects, liver damage, and immune suppression. However, the effects vary
greatly between species. A mouse may be able to handle a higher dose than a
cat. Dioxin enters a cell and binds to a receptor protein, which then attaches
to the cell's genetic material. How does dioxin's mechanism contribute to its
variable effects on different organisms?
A. Organisms that do not require receptor proteins to initiate genetic
expression are not affected by dioxin.
B. Dioxin only binds to receptor proteins that affect particular genes
in particular species.
C. Dioxin may bind to receptor proteins that inhibit expression in
some genes and promote expression in others.
O D. Genes that are inhibited by receptor proteins are not affected by
dioxin since they are not expressed anyway.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

answer: angiosperms

dicots

angiosperms are highly evolved plants, they produce seeds which are enclosed within in a carple. these are the largest group of plants on earth. they include trees, shrubs, herbs and small flowering plants. angiosperms exhibit a flowering stage in their life cycle. the flower serves the function of reproduction and fruit formation in majority of angiosperms. dicot is the term used to describe flowering plants that have two seed leaves. dicots are plants which develop seeds which split into two parts called cotyledons. each cotyledon contains one embryo.

here, a small purple flower development indicates that the plant belongs to angiosperms and having two embryonic leaves indicates it belongs to dicots.