[益卷]陕西省2025~2026学年度八年级第二学期课后综合作业(一)1数学A(北师大版)答案
[益卷]陕西省2025~2026学年度八年级第二学期课后综合作业(一)1数学A(北师大版)答案于2026-04-02发布，目前已经汇总了[益卷]陕西省2025~2026学年度八年级第二学期课后综合作业(一)1数学A(北师大版)答案的各科答案和试卷，更多试卷答案请关注本网站。
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[益卷]陕西省2025~2026学年度八年级第二学期课后综合作业(一)1数学A(北师大版)试题
[益卷]陕西省2025~2026学年度八年级第二学期课后综合作业(一)1数学A(北师大版)试题
（2024高二上·衢州期中）Enjoying a juicy watermelon is one of summer's greatest pleasures, particularly when you don't have to avoid any seeds. Indeed, humans have adapted many fruits to be seedless in search of a more pleasant eating experience.
The navel orange (a sweet orange that is usually seedless), for example, came about after a random genetic mutation (随机的基因突变) produced a single branch with seedless fruit long ago. Cuttings of the branch were joined to other trees, and today, all of the world's navel oranges are copies of this original. A similar discovery led to seedless grapes, which are thought to first appear in ancient Rome before making their way to the Americas in the 1870s.
Scientists have a few guesses about why plants might have developed these abilities. For one, plants can hybridize (杂交) more easily than some kinds of animals, and hybridization unlocks the new potential. Even if some combinations don't pan out, researchers have documented examples of "hybrid advantage", in which a hybrid is fitter than either of its parents. Lastly, because the purpose of fruit is to draw animals near to help spread their seeds, parthenocarpy, the production of fruits without fertilization (受精), may ultimately allow trees to produce more fruit at a lower energetic cost if they don't need to make seeds, too.
Regardless of why seedless fruits exist, they represent an interesting thought experiment, according to Stacey Smith, a plant evolutionary biologist at the University of Colorado Boulder. On the one hand, many are unable to continue surviving without human involvement, but on the other hand they're also wildly successful for that same reason. There are very few, if any, wild navel oranges, and yet it's estimated that California will produce 76 million cartons of them this year alone.
"My personal take is that all plants under human care have won in some sense, because they don't have to make more of themselves. We do it for them," Smith told Live Science. "Just because they're not reproducing sexually and making seeds, who cares We will never stop eating watermelons, and being able to make seedless ones just means we eat more watermelons."
32．What is the similarity between the orange and grape mentioned in the text
A．Being native to ancient Rome.
4、[益卷]陕西省2025~2026学年度八年级第二学期课后综合作业(一)1数学A(北师大版)答案
1、[益卷]陕西省2025~2026学年度八年级第二学期课后综合作业(一)1数学A(北师大版)答案
3、[益卷]陕西省2025~2026学年度八年级第二学期课后综合作业(一)1数学A(北师大版)答案
2、[益卷]陕西省2025~2026学年度八年级第二学期课后综合作业(一)1数学A(北师大版)试题
4、[益卷]陕西省2025~2026学年度八年级第二学期课后综合作业(一)1数学A(北师大版)答案
B．世界上没有绝对静止的物体
C．同一物体，选取不同的参照物，其运动情况一定不同
D．研究物体运动时，我们一般是随意选取任意一个物体作为参照物的
4．以下对生活中常见的物态变化现象描述正确的是（ ）
A．烧坏的日光灯管两端变黑，属于凝固现象
B．人游泳后从水中出来感觉冷，属于液化现象
C．北方冬季，外面冰冻的衣物也能晾干，属于升华现象
[益卷]陕西省2025~2026学年度八年级第二学期课后综合作业(一)1数学A(北师大版)答案
