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castortr0y [4]
3 years ago
10

What is the basis for most ecosystems?

Biology
2 answers:
zloy xaker [14]3 years ago
3 0

B. Every ecosystem has weather

Otrada [13]3 years ago
3 0
C-we need the sun for everything
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In what way is sedimentary rock formation in nature like a sieve?
Anna11 [10]
<span>B. Rocks go through many stages during their formation</span><span>

Sedimentary rocks together with the igneous rocks and the metamorphic rocks are the three main types of rocks that existed on earth. It is formed or made accordingly into four major ways. First, it is formed by depositing weathered remains of "clastic sedimentary rocks" or other rocks. Second, is through accumulation and the consolidation of sediments, thirdly is by depositing the results of biogenic activity and lastly it is formed through precipitation from solution. Limestone, shale, chalk clay and others are best examples of sedimentary rocks. </span>
6 0
3 years ago
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Tumors secrete chemical signals that cause blood vessels from the circulatory system to grow into the tumor, providing nutrients
mario62 [17]
The answer is D.Angiogenesis

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3 0
3 years ago
A mutation occurs at the midpoint of a gene, altering all amino acids encoded after the point of mutation. Which mutation could
goblinko [34]

Answer:

Deletion of two nucleotides.

Explanation:

Every amino acid coded by 3 nucleotides.

12:3=4 (amino acids)

6:3=2 (2 amino acids)

3:3=1 (1 amino acid)

After all of these mutations sequence amino acids change, but after continues stay the same.

Only deletion of 2 nucleotides will completely altered all amino acids encoded without mutation.

6 0
3 years ago
A woman and a man are both heterozygous for a recessive allele for a rare genetic disease. If they have one child, what is the p
makkiz [27]

Answer:

  • If they have one child, the probability that he or she will be affected is 1/4.
  • If they have two children, the probability that at least one of them will be affected is 7/16.

Explanation:

A cross between two heterozygous Aa individuals will produce the followinf offspring: 1/4 AA, 2/4 Aa and 1/4 aa.

Since the disease is recessive, 1/4 of the offspring will have the <em>aa </em>genotype and 3/4 of the offspring will be unaffected.

Every time they have children new gametes were generated <u>independently</u>.

The probability of having <u>no</u> affected children both times is, according to rules of probability for independent events, 3/4 × 3/4 = 9/16 (it's the probability of having a healthy child the first time multiplied by the probability of having a healthy child the second time).

The probability of having at least one affected child is 1 - probability of no affected children = 1 - 9/16 = 7/16.

8 0
3 years ago
How do cells in a multicelluar organism become specialized
kompoz [17]

Answer:

Explanation:

Each type of cell in a multicellular organism has slightly different DNA, allowing the different types of cells to specialize. ... The genes necessary for different types of cells to function segregate into different cell types in a multicellular organism.

7 0
3 years ago
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