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Stocks are ending mostly lower on Wall Street as the price of oil continues to nosedive and energy companies take large losses.

The strong dollar is again rippling through the market, pushing oil prices lower and pressuring energy and mining stocks. The price of U.S. crude reached its lowest price in almost four months.

Tesla Motors fell over 2 percent after it agreed to pay $2.6 billion for solar panel maker SolarCity.

The Dow industrial average lost 28 points, or 0. 2 percent, to 18,405.

The Standard & Poor's 500 index fell 3 points, or 0.1 percent, at 2,171. The Nasdaq composite rose 22 points, or 0.4 percent, at 5,184. The price of gold and silver rose, while copper fell.

Bond prices fell. The yield on the 10-year Treasury note rose to 1.51 percent.

MANUFACTURING: A survey by the Institute for Supply Management said U.S. factories expanded for the fifth month in a row, although its survey reading was lower in July than it was in June and factory employment decreased.

Two surveys show manufacturing activity in China was relatively weak in July, while manufacturing in the European Union grew at a slower pace than it did in June. Britain's manufacturing sector shrank.

THE QUOTE: Steve Chiavarone, associated portfolio manager for Federated Investors, said the dollar is getting stronger, and that's starting to hurt oil prices and slow down U.S. manufacturing.

The dollar is picking up strength because investors are realizing the Federal Reserve may raise interest rates later this year. When the dollar gets stronger, oil falls because it's priced in dollars. That hurts energy companies and other manufacturers.

"Manufacturing and oil have moved in lockstep for the better part of five years," Chiavarone said.

IONIS CLIMBS: Ionis Pharmaceuticals rose after it said a drug designed to treat spinal muscular atrophy in infants worked in a late-stage clinical study. It also said drugmaker Biogen exercised an option to develop the drug globally and will pay Ionis $75 million.

Biogen plans to start seeking marketing approval for the drug, nusinersen, in the next few months. Ionis surged $8.76, or 30 percent, to $37.95 and Biogen gained $12.75, or 4.4 percent, to $302.68, more than any other S&P 500 stock. Those moves helped pull health care stocks higher.

TESLA PLUGS IN: Tesla agreed to buy SolarCity for $2.6 billion in stock. More than a month ago it offered to buy the company for about $2.5 billion, and investors had hoped for a bigger offer. SolarCity has 45 days to seek better offers.

Tesla CEO Elon Musk owns more than 20 percent of both companies, and SolarCity is run by his cousin Lyndon Rive. The deal won't go through unless it's approved by a majority of shareholders other than Musk.

SolarCity also cut its guidance Monday. Its stock fell $2.10, or 7.9 percent, to $24.60 and Tesla Motors lost $4.14, or 1.8 percent, to $230.65.

SALE, CAESAR: Caesars Entertainment said it agreed to sell its social and mobile games business to a Chinese consortium for $4.4 billion. Its stock advanced 58 cents, or 8.4 percent, to $7.48.

VERIZON'S DEAL: Verizon Communications agreed to buy Fleetmatics Group for $2.4 billion, or $60 per share. Fleetmatics makes software that cable companies, energy companies and others use to manage vehicle fleets. Its stock jumped $16.64, or 38.7 percent, to $59.60 and Verizon fell 71 cents, or 1.3 percent, to $54.70.

OVERSEAS: Britain's FTSE 100 fell 0.5 percent while the CAC-40 in France gave up 0.7 percent. Germany's DAX fell 0.1 percent. Japan's Nikkei 225 stock index gained 0.4 percent and Hong Kong's Hang Seng index added 1.1 percent. South Korea's Kospi gained 0.7 percent.

OTHER ENERGY TRADING: Wholesale gasoline fell 2 cents to $1.30 a gallon. Heating oil shed 5 cents, or 3.8 percent, to $1.28 a gallon. Natural gas gave up 11 cents, or 3.7 percent, to $2.77 per 1,000 cubic feet.

METALS: The price of gold rose $2.10 to $1,359.60 an ounce and silver gained 15 cents to $20.50 an ounce. Copper fell 2 cents to $2.20 a pound.

CURRENCIES: Bond prices fell and the yield on the 10-year U.S. Treasury note rose to 1.50 percent from 1.45 percent, reversing most of a drop in bond yields on Friday. The dollar edged up to 102.31 yen from 102.03 yen. The euro fell to $1.1168 from $1.1179.