Wait, the user said "Keep names intact." So words like "respiratory system," "pancreas," "digestive system," etc., are names and should not be changed. Only other words that can have three alternatives. So I need to be careful not to replace the system names or the organ names.
Going through each part carefully, ensuring consistency and that the replacement options make sense in context. Avoid changing the meaning. For example, in "skin thickens," replacing with "thicken" synonyms like fortifies which are correct. shtatzania jave pas jave
Another example: "the child continues to grow and develop" becomes "the child continues to enlarge and evolve". Wait, the user said "Keep names intact
"During weeks 19 and 20, the child continues to grow and develop, with the body systems becoming more specialized." - "grow" can be "increase in size, expand, enlarge". - "develop" again. - "systems" can be "organs, biological functions, anatomical structures". - "specialized" as "more distinct, more specific, more focused". Going through each part carefully, ensuring consistency and