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klio [65]
3 years ago
7

Is it true that the struggle between organisms to survive in a habitat with limited resources called natural selection

Biology
1 answer:
OverLord2011 [107]3 years ago
4 0

False. That is competiton, the stuggle between different species to survive with limited resources. Natural selection is when they organisms with traits that help them survive pass them (the traits) on through reproduction. This makes their valuable traits possible to rise in their offspring.
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What are the main functions of the human skeletal system
maw [93]

Answer:

To support the body and give it mobility, as well as protect organs

Explanation:

It provides something for the muscles to attach to, supports it, and protects vital organs

7 0
3 years ago
Read 2 more answers
IS IT WEATHERING, EROSION, OR DEPOSITION?
Sholpan [36]

Answer:

Weathering

Explanation:

The answer is weathering because, weathering is the breaking or wearing down of rocks, soil, minerals, and wood. The water wore down the rock, making it smooth, so it connects to the definition that i just gave you.

Hope it helped!

4 0
3 years ago
Colton has an ice cube that has a mass of 4 grams. He places it in a sealed container and then puts it in the microwave on high.
Jobisdone [24]

Hello!

The sentence that best describes what Colton discovers is D) The mass of the melted ice cube remained the same at 4 grams.

<h2>Why?</h2>

The melting of the ice cube is a physical process. That means that it is a process in which the identity of the substance (water) doesn't change, but only how their molecules are arranged.

In melting, a substance in the solid state changes to the liquid state. Its molecules go from having a definite volume and shape to having the same shape as the container that holds it, but there are no changes in the mass of the substance.

If the container is closed, Colton should record the same mass as the initial one, as mass doesn't change in physical processes.

Have a nice day!

8 0
3 years ago
Read 2 more answers
A. A cell has n=3. How many total chromosomes are in a diploid cell?
Paha777 [63]
Answer

46 chromosomes


Explanation Diploid cells do not have a set number of chromosomes that depends on the species. Diploid means that the chromosomes in the cell are in pairs ie two of each type. A human diploid cell has 46 chromosomes in 23 pairs.
4 0
3 years ago
Đem giao phấn giữa hai cây bố mẹ đều TC thì được F1 xuất hiện một khiểu hình . Tiếp tục cho F1 tự giao phối với nhau thì thu đượ
seropon [69]

Answer:

Đưa về tỉ lệ kiểu hình ta được:

F1 x F1 => F2:

\frac{711}{79}

cây cao, quả đỏ:

\frac{240}{79}

cây cao, quả xanh:

\frac{238}{79}

cây thấp, quả đỏ:

\frac{79}{79}

cây thấp, quả xanh.

Explanation:

<=> 9 cây cao, quả đỏ: 3 cây cao, quả xanh: 3 cây thấp, quả đỏ: 1 cây thấp, quả xanh.

Xét từng cặp tính trạng:

* Cặp tính trạng chiều cao:

Cao: Thấp = 3:1 => tính trạng thân cao trội hoàn toàn so với thân thấp.

* Cặp tính trạng màu sắc quả:

Đỏ: Xanh = 3:1 => tính trạng quả đỏ trội hoàn toàn so với quả xanh.

Qui ước gen:

A: thân cao                     a: thân thấp

B: quả đỏ                        b: quả xanh

Lấy tích cả 2 cặp tính trạng: (3 cao: 1 thấp)(3 đỏ: 1 xanh) = 9 cao, đỏ: 3 cao, xanh: 3 thấp, đỏ: 1 thấp, xanh => tỉ lệ bằng với tỉ lệ đề bài => 2 cặp gen qui định 2 cặp tính trạng di truyền theo qui luật phân li độc lập.

Suy ra kiểu gen:

- Ở cặp tính trạng chiều cao có tỉ lệ kiểu hình 3 thân cao: 1 thân thấp => bố mẹ F1 phải cho 2 giao tử và mang gen a.

=> F1 x F1 = Aa x Aa. (1)

- - Ở cặp tính trạng màu sắc quả có tỉ lệ kiểu hình 3 quả đỏ: 1 quả xanh => bố mẹ F1 phải cho 2 giao tử và mang gen b.

=> F1 x F1 = Bb x Bb (2).

Từ (1) và (2) => Bố mẹ F1 phải có kiểu gen AaBb x AaBb.

Vì đem lai 2 bố mẹ thuần chủng nên ta sẽ có 2 trường hợp.

Trường hợp 1:

P: AABB x aabb

G: AB       ; ab

F1: 100% AaBb.

Trường hợp 2:

P: AAbb x aaBB

G: Ab     ;  aB

F1: 100% AaBb

6 0
3 years ago
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