A student plays the trombone by vibrating air in the instrument through a mouthpiece. The air vibrates through the tubes, and the sound exits the bell. When the student positions the slide at positions P through R, different notes are heard from the bell. The frequencies of the notes at each position are listed in a table.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

thinking it would be d not too sure but i think it's right

fumikage isn't really a bird, and tsuyu does have teeth. tsuyu has a transformation quirk which still allows her to be partially human. otherwise we'd have a large frog running around. fumikage has teeth because again, he isn't a bird. his head was a quirk mixture if i'm correct.