Sinh sản của cá:

-Cá cái đẻ trứng với số lượng lớn từ 15-20 vạn trừng vào các cây thủy sinh.

-Thụ tinh ngoài.

Sinh sản của ếch:

-Đẻ nhiều trứng.

-Thụ tinh ngoài.

Sinh sản của thằn lằn:

-Đẻ từ 5-10 trứng.

- Thụ tinh trong.

Sinh sản của chim:

-Đẻ 2 trứng.

-Thụ tinh trong.

Sinh sản của thú:

-Đẻ con.

-Thụ tinh trong.

-Chất khí CO

- Chất khí Cacbon monoxit (CO)

         Vì :

        +Hêmôglôbin (Hb) trong máu sẽ kết hợp dễ dàng và chặt chẽ với CO tạo thành HbCO

         +HbCO là một hợp chất rất bền khó bị phân tích ⇒ do đó khí Cacbon monoxit sẽ chiếm chỗ O₂ trong hồng cầu .

khí CO

Dựa vào các di tích hóa thạch người ta đã chứng minh lưỡng cư cổ bắt nguồn từ cá vây chân cổ, bò sát cổ bắt nguồn từ lưỡng cư cổ, chim cổ và thú cổ bắt nguồn từ bò sát cổ.

→ Đáp án B

Ta có

\(m_{CuCl_2\left(1\right)}=\dfrac{300.15\%}{100\%}=45g\\ C_{\%CuCl_2\left(3\right)}=\dfrac{45+\dfrac{m.5,4\%}{100\%}}{300+m}\cdot100\%=11,8\%\\ \Rightarrow m=150g\)

Chúc thi tốt nhé  

The way in the zoo is cemented. The flowers in the path decorate the zoo fresh cool. Animals and birds are raised in an iron bar. There are many strange animals. Beautiful splendor is the peacock with colorful tail tail fan. A public barn has a male drummer and five or six coffins. In his "kingdom", he made his appearance, batting smoothly. Going further steps, we go to the breeding area of ​​the beast. The shelter is solid, the bar is thick and thick. Inside the tiger, lion, lion, rhinoceros, hippopotamus ... each cage has one to two children. Tiger with soft body, flexible, very beautiful color. Beautiful and bright tiger eyes. Kia is a lion's cage, the lion with a fierce feather, looking very majes. The lion man himself a cage, he has a long time, sometimes head to look at tourists. The most monkeys are monkeys. Seven monkeys kept a cage. They talk to each other, sometimes hissing sound very sharp. Monkeys have hands, feet human hands. She grasped the food, swinging in the cage with her long and skillful arm. Each animal cage has the name of the animal in the barn and the board prohibits visitors for food. Therefore, visitors to the zoo can only see, listen to the guide explained not to eat. However, at the same time a few bold boy cane sugar, sweet potatoes to feed. Most impressed with me is the camel house. The camel with the hump on his back is very funny, cute. Camel high, great but gentle. A camel has four or five in common. They are in harmony with each other. Visitors to the zoo pretty crowded. Calling each other, admiring the visitors to do the bustling, bustling. Each group of visitors and children as much as the flow because it is a holiday. Despite the excitement but every tourist group has the discipline and show a civilized lifestyle, but the zoo is crowded but still orderly and fun. Slowly in the forest colorful people colorful, the blue shirt of the zoo staff softly decorated the zoo elegant, polite and warm. Some of the staff explained something to the guest and the laughter rose, bursting out, it was refreshing.