As a species,ginkgo(银杏）trees, which enjoy a reputation as "The Tree that Time Forgor", have existed relatively unchanged for 200 million years.While scientists have revealed the mysteries of the tree's long life, it won't help humans soon.

Scientists in China examined the genetic component of very young ginkgo trees,comparing samples between several hundred and a thousand years old.【小题1】The scientists also found that, unlike other plants, ginkgo genes with regard to aging do not automatically become active at a certain stage in their life cycle.【小题2】This explains why old ginkgo trees produce as many seeds as young ones and how they continue to grow wide for as long as they live.

Furthermore,ginkgo trees are born with protective biochemical characteristics,in the form of hormones, antioxidants, and bactericides.【小题3】Also, they have evolved adaptations that enable them to resist pests and climate extremes.

【小题4】Over time,weather and other factors limit upright growth and cause leaves to die.Yet,even as this aging occurs, the cell-reproducing system of the gingko tree remains active, maintaining healthy growth.Growth typically starts slowing down after 200 years, but the trees remain healthy.Each year, they renew their parts, adding new wood,leaves, roots, and reproductive organs.In theory,gingko trees should live forever.【小题5】

Pets can add extra fun to your everyday life. 【小题1】 More importantly, you need to take care of its nutrition and health.

【小题2】 While your pet’s diet will be different depending on what type of animal it is, it’s important to feed it fresh food regularly. Choose food that’s fit for your pet, and only give your pet treats (美味食物) occasionally. If you have any questions about what to feed your pet, consult your veterinarian (兽医).

Feed your pet the suggested amount of food at each meal. Be sure to follow the suggestions on how much your pet needs to eat each day. Feeding too much leads to becoming too fat. 【小题3】 These could include heart disease, kidney (肾) problems, and so on.

Know what foods you should never give your pet. 【小题4】 So be sure you know what you can and can’t give your pet before you offer it a treat. For example, while it’s perfectly fine to give you dog small bits of chicken or fish, you should never give them food containing chocolate or garlic, as these can be harmful.

Give your pet fresh water every day. All animals require water to live, although some will need much more than others. No matter what the size of your pet is, make sure that it always has access to fresh, clean water. Check or refill the water once or twice a day and if they drink from a bowl, wash out the bowl every 2 to 3 days. 【小题5】.

The answer to protecting and saving marine(海洋) wildlife can start with cutting back on something Americans use every day—plastic drinking straws. Actor Adrien Grenier, best known for playing Vincent Chase in 2015 movie Entourage, has launched a campaign to reduce the amount of single-use plastic usage in this country in order to protect and save marine wildlife and the environment. Plastic drinking straws are among many single-use plastic products contributing to the shocking loss of marine life, but they’re a great place to start because they’re something Americans are using by the hundreds of millions without any awareness that they’re so damaging.

According to Ecocycle, an international environmental organization, Americans use more than 500 million straws daily, which are enough to fill 127 school buses each day, and they can’t be recycled. They means plastic straws end up in landfills or oceans, where fish and other marine wildlife mistake the small bits for food and swallow them. After seeing a photo of a whale beached on the shore with a belly full of plastic, Grenier felt the inspiration to launch the Lonely Whale Foundation, hoping to inspire and educate others on the challenges facing marine life.

Along with stopping the use of straws, Grenier hopes to educate consumers on the dangers of other single-use plastic items such as grocery bags and water bottles. While many Americans use these plastic products in their daily life, there are more sustainable alternatives that can help protect the environment. Ecocycle recommends the use of straws made from stainless steel, glass, and even bamboo instead of plastic. You can buy a number of these environmentally friendly straws online and in stores.