G How do cytochromes donate and accept electrons? Each cytochrome has an iron‑containing heme group that accepts electrons and then donates the electrons to a more electronegative substance. Cytochromes donate electrons directly to the energy‑carrier molecules NAD + NAD+ and FAD FAD and accept electrons from less electronegative substances. The cytochromes donate electrons excited by photons to other cytochromes that accept electrons as replacements for lost electrons. Every cytochrome's iron‑containing heme group accepts electrons from oxygen and donates the electrons to the next cytochrome in the chain.

Explanation:

Cytochromes are critical participants in the electron transport chains used in photosynthesis and cellular respiration

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.