Paramecium eat bacteria, so they are consumers and bacteria are decomposers. How to draw the food chain We can't start with bacteria, we can't start with Paramecium, because there are no decomposers in the food chain, and we have to start with producers

Not all bacteria are decomposers. Many bacteria are also producers. If bacteria are eaten here, then bacteria are producers and Paramecium are consumers

What are the biological chains between organisms

The biological chain can also be understood as the food chain in nature. It forms the phenomenon of "one thing falling into one thing" in nature and maintains the natural quantity balance among species. The biological chain refers to the interdependent chain relationship formed by the mutual provision of food by animals, plants and microorganisms. This relationship is easy to see in nature

1:24 () 1 right 1 / 4 1.3 hours () 1 hour 3 minutes 3.8 square kilometers () 3800 hectares 6 liters 50 ml () 6.2L cubic decimeters

1:24 (>) 1 right quarter hour
1.3 hours (>) 1 hour 3 minutes
3.8 square kilometers（

Yushu County, Qinghai Province, a 7.1 earthquake occurred in the early morning of April 14, 2010
How many days will it take to transport four fifths of the goods if they are transported by small trucks alone?
(1) If the goods and materials are transported by trucks at the same time, the ratio of the goods and materials transported two days later to the goods and materials is 1:3
(2) If it is transported by truck alone, 1 / 2 of this batch of materials can be transported in 5 days
Don't rush,

2 days together = 1 / 3;
Two cars and efficiency = 1 / 3 △ 2 = 1 / 6;
Large truck efficiency = 1 / 2 △ 5 = 1 / 10;
Small truck efficiency = 1 / 6-1 / 10 = 4 / 60 = 1 / 15;
Days = 4 / 5 (1 / 15) = 12 days;
If you don't understand this question, you can ask,

How many cubic meters is a ton of stone?

I need to know the density of the stone

5x - (20-x) △ 2 × 1 = 67

5X-（20-X)÷2×1=67
5x-(10-x/2)=67
5x-10+x/2=67
5.5x=77
x=14

What is "ascending power, descending power"?
Exercise: [2x + 5x-4x] arrange by ascending power []

Power means that all known term exponents and ascending power means that exponents increase by degrees, and the power order is the same, so there is no need to arrange them

In proportion, is the product of two external terms equal to the product of two internal terms

I didn't make it clear

A rectangular carton is twice as long as wide, 6cm high, 84cm long and how many cm wide

(84 * 4-6) * (1 + 2) = 5 (CM) "*" is a division sign. Divide the sum of edge lengths by 4, which is equal to the sum of length, width and height, and then subtract the sum from the height, which is equal to the sum of length and height. Because "length is twice the width", width is unit one, and length is "2". Divide the sum by 3 units one, which is equal to unit one (length of width). Let width be x

There are several data, the maximum value is 124, and the minimum value is 103. When describing with frequency distribution table, if the group distance is 3, how many groups should be divided?
Seven or eight?
Group number = (max min) / group distance
Can't it be divided into seven groups?

8 groups
Generally, the group distance is determined by the group number first, and then the formula is: group distance = (max min) / group number. The group distance is usually an integer
The interval of numbers falling in each group is: one side is open interval, generally closed interval. This is to avoid the same value falling in different groups
If you take 7 groups, you can't take 103 and 124 at the same time

Paramecium eat bacteria, so they are consumers and bacteria are decomposers. How to draw the food chain We can't start with bacteria, we can't start with Paramecium, because there are no decomposers in the food chain, and we have to start with producers