About 80% of the air consists of nitrogen. Certain types of bacteria present in soil convert this nitrogen into nitrogen compounds, which can be used by plants. Plants absorb these compounds through their roots and use them to grow. When living organisms consume plants, the nitrogen products enter their bodies. Based on this description, arrange the subsystems in the order that nitrogen has moved through them. ​

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed

When an object is moving away from you while still making a sound, the pitch of the sound is perceived to a. lower b. unchanged c. fluctuating d.higher

The basic kind of life cycle found in the simplest animals is: haplontic or diplontic