Answer:
Endoderm
Explanation:
The embryo has three germ layers. The ectoderm, mesoderm, and endoderm. The endoderm is the innermost layer. Other than the endocrine glands, the other tissues that develop from the endoderm are the gastrointestinal tract, urinary and auditory system, and the respiratory tract.

The designation Rr for a pea-plant's peas shows that the plant is a <u>true-breeding plant</u>.
Algae will be overgrown and larger fish will begin to die out as the carrying capacity has lowered due to a limit in food.