课本原文课文译文Facts About Trees关于树的事实Trees are tall plants.树是很高的植物。Trees can live for thousands树可以活数千年。of years.Some trees can grow taller than一些树可以长到100多100 metres.米高。Trees produce oxygen(氧气) and reduce树制造氧气并且减少空the amount of carbon dioxide(二氧化碳...
Facts About Trees Trees are tall plants.Trees can live for thousands of years.Some trees can grow taller than 100 metres.Trees produce oxygen (氧气) and reduce the amount of carbon dioxide (二氧化碳) in the air.The roots of a tree usually grow underground. They help keep the tree stable ...
size, color and chemistry, all of them are classified as nonflowering. The very first plants on earth were marine nonflowering plants. It is estimated that nonflowering plants started to grow on land about 450 million years ago. For the next 320 years all plants remained...
At some point, the plant switches from vegetative growth to reproductive growth. "Something in the environment, the length of the day, the quality of light, tells these plants it's time to stop making leaves and start making flowers," Deal says. "A really important question is how this sw...
Use the lesson called How Plants Grow: Lesson for Kids to learn more about this type of growth. Also, use this lesson to: See what photosynthesis involves Look at different parts of a plant Figure out how plants grow You are viewing quiz7 in chapter 5 of the course: ...
Evergreens are plants that retain their leaves all throughout the year. They are the opposite of deciduous plants, which have foliage that falls off upon maturity. Many different varieties of evergreens exist, both shrubs and trees. Some examples of ever
Many cultivatedbananasand almost all cultivated plantains belong to triploid cultivars of Musa X paradisiaca. It is relied that the farmers of Southeast Asia domesticated M. acuminata. The cultivated plants then spread north-west into areas where M. balbisiana was inherent hybrids between two species...
It is this subordination to the natural environment and the resources it provides [plants and animals] that constituted a check to population increase.… [P]recipitation is the principal factor limiting both the resources available to hunters and gatherers and their numerical growth. The Neolithic ...
like nutrients and water on the floor of the tropical rainforest is fierce. Extensive systems of tree roots soak up much of the nutrients and water. In a mature rainforest, the lower layers of the forest tend to be open because the lack of sunlight and nutrients limits plant growth. ...
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