About four or five days after ferilization, a group of cells forms a ball like structure. What is the name of this structure

If a cell's main function is to produce proteins to be excreted, which organelles would you expect to be larger

What is an endocrine function? (apex) a. esophageal glands release mucus into the esophagus b. salivary glands release saliva into mouth c. swear glands release sweat to the skin d. the pineal gland releases melatonin into the bloodstream

Crossing over is a method of (blank)?