Yes the primary succession is the difference other secondary succession
Answer:
B
Explanation:
Many organs such as stomach, teeth, are some things that make up the digestive system.
remember: organelles -> cells -> tissue -> organ -> organ system -> organism.
I'm gonna say D is the answer.
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.
