Why is it a good idea to brush teeth after eating? A Acidic conditions help bacteria to grow.
B Acids dissolve tooth enamel. C Alkaline conditions help bacteria to grow.
D Alkalis dissolve tooth enamel.​

Acids dissolve tooth ename

Explanation:

By brushing your teeth after you eat, you reduce this bacteria and help protect your enamel from damage. For the best results, use toothpaste that contains fluoride to prevent tooth decay, and triclosan to reduce plaque and gingivitis.

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.