What can I do during pregnancy to remove the appearance of stretch marks?

Not much you can do . Stretch marks are common and genetics play a big role. If your mom had them you probably will too. You can change your "jeans" but not your "genes." try not to gain more than the recommended amounts of weight. Many people use over the counter skin lotion. This keeps the skin healthy and decreases itching but may not prevent stretch marks.
Not much. Unfortunately there is not much you can do about this. Laser treatment may help reduce the appearance but this would be a cosmetic treatment and you may continue to get more as your pregnancy progresses.