The aorta returning oxygenated blood to the heart from the lungs.

The right atrium receives deoxygenated blood from the systemic circuit.

The left ventricle pumping deoxygenated blood to the lungs for gas exchange.

A single circulatory system where blood is pumped past the gills and then onto the rest of the body.

The pulmonary circuit returning oxygenated blood from the gills.

Aromatase activity decreases with temperature.

17𝛃-HSD activity increases with temperature.

17𝛃-HSD activity decreases with temperature.

Aromatase activity increases with temperature.

estrogen-driven ovary development.

genetic regulation of ovary development.

sex determining genes on the Y chromosome.

the sex steroid testosterone.

It allows fertilization to occur externally in water.

It enables gas exchange through the skin, reducing the need for lungs.

It provides a self-contained aquatic environment that protects the embryo from desiccation and mechanical shock.

It eliminates the need for parental care during development.

in response to cues from the environment.

as a result of circulating sex steroids.

due to the loss of the Y chromosome.

on a cell by cell basis.

Adapt via natural selection to increase its rate of reproduction.

Have a low level of reproduction to maximise resource use.

Reproduce asexually by budding.

Engage in sexual reproduction.

None of the above: cultivated bread wheat is a domesticated plant, and not subject to evolution like wild plants.

Allopatric speciation.

Allopolyploidy.

Genetic drift.

Endocrine disrupters in the waterways disrupt sex ratios.

Combinations of thermal stress from global change and chemical contaminants can alter sex ratios in ways that are difficult to predict.

Changes in sex ratios due to the effects of increasing temperatures caused by global change will always be reversed due to endocrine disruptors.

Increasing temperatures due to global change can alter sex ratios.