Summary of knowledge points of biology book for the second semester of grade seven (all) It's the version of biology book published by Jinan publishing house Compulsory education curriculum standard experimental textbook biology _______________________ Grade 7 Volume 2 It is also written in the top left corner: approved by the national primary and secondary school textbook examination and Approval Committee in 2004 It's this version of seven biology books. I hope some of them can summarize the knowledge points of the whole book. It doesn't need to be too detailed. Just summarize the knowledge points. Thank you

Methods: 1) skin: excrete water, inorganic salt and urea in the form of sweat; 2) respiratory system: excrete carbon dioxide and water in the form of gas

Summary of three required knowledge points of biology PEP

The discovery process of auxin (a) the discovery of auxin: in the tropism experiment, the tip of the plant has photosensitivity. One side light causes the uneven distribution of auxin, one side of the backlight has more auxin, and the polarity of auxin transports to the lower end, which makes the backlight side grow fast, and the plant shows the growth of bending to the light source

Use a rectangular sheet of iron 40 cm long and 20 cm wide to make a 5 cm deep uncovered cuboid box. Find the maximum volume of the cuboid box

Length = 40 - 2 × 5 = 30
Width = 20 - 2 × 5 = 10
V = 30 × 10 × 5 = 1500 (CC)

There are 28 workers in a woodworking factory. Two people can make three tables a day, and three people can make 10 chairs a day. When you ask how to allocate workers, it's just one table with four chairs

X people make chairs, 28-x people make tables
X÷3x10=（28-X）÷2x3x4
10X/3=168-6X
28X/3=168
X=18
28-18=10
A: 18 people make chairs and 10 people make tables

What is the conversion of mathematical area unit plus the answer that 1260 square centimeters equals 200 square decimeters

200 square decimeters = 20000 square centimeters
20000-1260 = 18740 cm2

During the Spring Festival, Xiao Ming and Xiao Ying visit Mr. Li, who gives them a piece of sugar in a special way. Mr. Li first gives Xiao Ming a piece of sugar, then gives him one seventh of the sugar left in the sugar box, then gives Xiao Ying two pieces of sugar, and gives her one seventh of the sugar left in the sugar box?

Suppose there are x pieces of candy in Teacher Li's candy box, 1 + 17 (x-1) = 2 + 17 [x-3-17 (x-1)], x = 36. (7 points) answer: there are 36 pieces of candy in Teacher Li's candy box

Simplify the following scores. (writing process) (1) 7-21 (2) - 36-3 (3) - 8-54 (4) - 0.3-6
Calculation. (write process)
（1）-6x（-5）x（-7）
（2）0.1÷（-0.001）÷（-1）
(3) - 6x (- 0.25) x111 / 4
（4）-9x（-11）÷3÷（-3）
Calculation. (write process)
(1) 23x (- 5) - (- 3) △ 3 / 128
（2）-7x（-3）x（-0.5）+（-12）x（-2.6）

(1) Original formula = - 115 - (- 3) x 128 / 3
=-115+128
=13
(2) Original formula = 21x (- 0.5) + 31.2
=20.7

Give you a balance, a ruler, a pencil, how to measure the length of a roll of thin copper wire, write your method

Use a ruler to measure the length of copper wire L1 2, balance to measure the mass of copper wire M1 3, cut the length of copper wire L2, and balance to measure the mass M2 L1 / M1 = L2 / m2, bring in the known quantity L1 = l2m1 / m2. I miss the third day of junior high school

Sixth grade volume two Chinese exercise book Lesson 12 answer to question 5
The story of Zhang sider

1. There are two things about Zhang sider in the essay, namely, burning charcoal and weaving straw sandals
The transitional sentence is the first sentence of the second natural paragraph
3. I understand that Comrade Zhang sider is hardworking, and this spirit is worth learning
Although you may have finished it in so many days, you'd better adopt it

It is known that the greatest common factor of two numbers is 12, the least common multiple is 72, one number is 24, and the other number is 72______ .
Can there be a process?
I want to know the process of solving the problem

Formula: the greatest common factor multiplied by the least common multiple divided by one number = another number
12*72/24=36