2. The sand absorbs enough moisture to support drought-resistant plants such as mesquite, as well as several species of grasses
3. A marketing firm must be able to evaluate the sales potential in future markets as well as in markets that the firm currently serves.
4. The Irish ans others were eagerly absorbed as construction laborers on road,bridge, and railroads as well as in factories.
1.2.3.4 네 문장 다 as well as 쓰였는데요..
1.2 문장은 as well as 앞에 컴마가 있는데.. 3.4 문장은 없구요.
as well as 앞에 컴마의 유무는 무슨 차이인가요 ? ?