Science Basics

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6
5
2
1
3
8
7
4
9

横向

1

Icy body with a tail near the sun

4

Hottest planet in solar system

6

Particle of light

8

Second lightest element

9

Basic unit of life

纵向

2

Chemical element in table salt

3

Biological catalyst

5

Form of thermal energy

7

Center of an atom or cell