Renee, pregnant for the first time, wonders how the developing organism receives nutrients and oxygen and rids itself of waste. this principal organ of exchange between the mother and the developing organism is the

Placenta

Explanation:

The product of fertilization in sexually-reproducing organisms like humans is the ZYGOTE which develops into embryo and gets implanted in the uterus/womb of the female where it undergoes growth. The uterus of a female is designed to cater for the developing foetus's needs e.g nutrients, excretion, etc as mentioned in the question.

Renee, being pregnant for the first time wonders how this happens. It occurs through an organ unique to mammals called PLACENTA. Placenta serves as a connection point between the mother and the fetus. The placenta helps the mother to internally pass usable nutrients and oxygen to the fetus and also transfer waste products from the fetus to the mother's blood. Since, the fetus cannot yet derive these life-dependent substances itself, the mother transfers them to it through the placenta.

Therefore, Reene need not wonder because the placenta in her uterus helps do the job.

the statement is true

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).