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4 tháng 9 2021

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4 tháng 9 2021

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21 tháng 10 2015

2 tan 7 ta =27 ta

Con bo nang : 27-25=2 ta

Ca 2 con nang : 27+2=29 ta

4 tháng 11 2021

2 tan 7 ta =27 ta

Con bo nang : 27-25=2 ta

Ca 2 con nang : 27+2=29 ta

17 tháng 10 2015

2 tấn 7 tạ =27 tạ

Con bò nặng 

27-25=2 tạ

Tổng số cân nặng của con bò và con voi là

27+2=29 tạ

 

4 tháng 8 2017

có tất cả 1 con voi và 1 con lợn.

4 tháng 8 2017

có 1con lợn và 1 con voi

9 tháng 3 2020

có môt chiếc máy bay chở 500 trái sầu riêng hỏi rớt một trái sầu riêng còn bao nhiêu trái ? còn 499 trái sầu riêng

vì sao bà cụ qua cầu bị chết ? Vì bị sầu riêng rơi trúng đầu

làm thế nào để nhét con voi vô tủ lạnh? mở của tủ ra cho con voi vào rồi đóng cửa tủ lạnh vào

Trên triều đình mời tất cả các con vật lên hỏi vì sao con voi ko lên họp? con voi đang trong tủ lạnh

1.còn 499 trái sầu riêng

2.vì bị sầu riêng rơi trúng đầu

3.mở cửa tủ lạnh ra rồi nhét con voi vào

4.vì nó ở trong tủ lạnh rồi ko lên được

8 tháng 6 2017

Đáp án C

Sự tương đồng về đặc điểm giải phẫu giữa các loài => bằng chứng giải phẫu học so sánh

Tất cả các loài đều được cấu tạo từ tế bào => bằng chứng sinh học tế bào

Bằng chứng sinh học phân tử là những bằng chứng liên quan đến các loại phân tử nhỏ như ADN và protein, những phân tử quy định thông tin di truyền của cơ thể và thực hiện chức năng trong tế bào

Các ý đúng: 1,3,4

 

23 tháng 8 2023

a) Đổi 1 tạ 40 kg = 140 kg

Con bò nặng số ki lô-gam là:

140 + 220 = 360 (kg)

Con bò và con bê nặng tất cả số kg là:

360 + 140 = 500 (kg)

b) Cân nặng của con voi là:

500 × 2 = 1 000 (kg) = 1 tấn

Đáp số: a) 500 kg

b) 1 tấn

23 tháng 8 2023

a) Con bê cân nặng 1 tạ 40 kg. Con bò nặng hơn con bê là 220 kg. Hỏi con bò và con bê nặng tất cả bao nhiêu ki-lô-gam”?

Ta có: 1 tạ 40kg = 140 kg

 => Số kg Con bò là:

 140 + 220 = 360kg

Số kg con bê và con bò là:
140 + 360= 500

b) Số tấn con voi cân nặng là:

500 x 2 = 1000 kg = 1 tấn

23 tháng 2 2019

Chọn đáp án A

Bằng chứng sinh học phân tử liên quan đến mã di truyền, ADN, protein,... Chọn 1, 3, 4.

3 tháng 2 2019

Chọn đáp án A

Bằng chứng sinh học phân tử liên quan đến mã di truyền, ADN, protein,... Chọn 1, 3, 4.

STUDY TIP

- Cơ sở vật chất chủ yếu của sự sống là các đại phân tử: ADN, ARN và protein.

- Tất cả các loại có vật chất di truyền là ADN trừ một số loại virut có vật chất di truyền là ARN. ADN có vai trò là vật chất mang thông tin di truyền. ADN của các loài đều được cấu tạo từ 4 loại nuclêôtit. ADN có vai trò mang và truyền đạt thông tin di truyền.

ADN của các loài khác nhau ở thành phần, số lượng, trình tự sắp xếp của các loại nuclêôtit. Chính các yếu tố này tạo nên tính đặc trưng cho phân tử ADN của mỗi loài. Sự giống và khác nhau nhiều hay ít về thành phần số lượng và đặc biệt trật tự sắp xếp của các nucleotit phản ánh mức độ quan hệ họ hàng giữa các loài