The San Francisco 49ers are still winless after being dismantled by the Dallas Cowboys, 40-10, in Week 7. It was a comprehensive showing from the Cowboys as Dallas dominated the game from wire to wire.

Here's what we learned on Sunday at Levi's® Stadium.

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1.** The 49ers didn't have an answer for Ezekiel Elliott. Dallas' star running back racked up a gaudy 219 total yards (147 rushing, 72 receiving) and three touchdowns. After scoring twice in the first half, Elliott took a short screen pass all the way for a 72-yard touchdown. San Francisco had shown well against the run in previous weeks, but Sunday was clearly a step backwards as Dallas posted 265 rushing yards.

Dak Prescott threw for 234 yards and three touchdowns. Jason Witten had a highlight-reel, one-handed touchdown grab and Dez Bryant scored on a 2-yard touchdown catch. All Cowboys starters were pulled in the fourth quarter with the game well in hand. Dallas posted 501 total yards.

2. C.J. Beathard completed 22-of-38 passes for 235 yards, no touchdowns and no interceptions in his first-career start. The 49ers didn't find the end zone until the game was well out of reach. Beathard's 4-yard touchdown run in the fourth quarter marked San Francisco's lone trip to the end zone. Marquise Goodwin led the 49ers with 80 receiving yards on four receptions. Beathard carried the ball five times for 30 yards.

3. Reuben Foster made his return to action. He had one tackle for loss in the first half but was relatively quiet otherwise. Foster left the game in the second half with a rib injury and did not return. He finished with five total tackles.

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4.** Trent Brown left the game early with a head injury and was replaced at right tackle by Garry Gilliam. Rashard Robinson and K'Waun Williams each left the game briefly, but both corners returned.

5. Dallas' pass rush was dominant. The Cowboys sacked Beathard five times and delivered several more big hits to the rookie quarterback. Two of the sacks resulted in lost fumbles. Five different players accounted for the sacks. Alternatively, the 49ers defense failed to register a sack.

6. After the 49ers forced a three-and-out on the game's opening possession, Trent Taylor fumbled the ensuing punt to kill San Francisco's momentum. Dallas scored shortly thereafter and never looked back.

7. Pierre Garçon dominated touches at running back, carrying the ball 14 times for 68 yards. Matt Breida had just three carries for five yards.