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Oduvanchick [21]
2 years ago
13

All of the following contributed to speciation in Darwin's finches except

Biology
2 answers:
neonofarm [45]2 years ago
8 0
<span>The correct answer is C. lack of competition. It was exactly the opposite, the competition caused them to adapt and change their beak shape and size in order to be more proficient in getting food. This is what he described in his theory on how finches speciated and became genetically different from other finches similar to them.</span>
liq [111]2 years ago
5 0
I just took the test and made a 100% the answer is C. lack of competition
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Use the mechanisms of meiosis to explain why most mules are sterile.
Tema [17]

Answer:

3. An even number of chromosomes are required for synapsis during prophase I and proper pairing during metaphase

Explanation:

Mules are hybrids of a cross between a female horse and a male donkey. Horses contain 64 chromosomes while donkeys contain 63 chromosomes in their somatic cells respectively. This means that they each produce 32 and 31 chromosomes respectively during meiosis. A mule, hence, contains 32+31= 63 chromosomes in their somatic cells.

This chromosome number in mules are uneven for meiosis to occur because meiotic division requires that an even number of homologous chromosomes pair together in a process called SYNAPSIS during prophase I of meiosis I. This is impossible in a mule because of the uneven number of chromosomes in its cells.

Also, during metaphase of meiosis, the homologous chromosomes need to be properly aligned at the equator for separation to occur. This is also impossible in a mule considering the number of chromosomes that don't add up.

Due to this reason of unevenness in the number of chromosomes present in a mule, meiosis will not occur and if meiosis (gamete formation) does not occur, reproduction cannot take place. Therefore, the mule is a sterile species i.e. cannot produce offsprings via sexual reproduction.

4 0
2 years ago
How did the results of the ecological calculations come out?
dolphi86 [110]

Answer:

im new

Explanation:

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7 0
3 years ago
Match the prokaryotic cell structures to the characteristic of life.
djverab [1.8K]

Answer:

1. Nucleoid: Prokaryotes do not have well defined nucleus. Instead, naked DNA or genetic material is found in the these cells which keeps floating freely in the region of cytoplasm called as mucleoid (nucleus-like). DNA carries the genetic information required for growth, development, metabolic activities and reproduction.

Hence, it must match with b. reproduction: DNA ensures that future generations will be similar to parents

2. Cell wall: Cell wall is the outermost layer surrounding the plasma membrane. It is composed of polysaccharides and is found in bacteria, fungi, and plant cells. In bacteria, it is generally composed of peptidoglycans. Antibiotic such as penicillin acts on the cell wall and creates pores in it which kills the bacteria.

Hence, it can be correctly matched with d. homeostasis: taking an antibiotic, such as penicillin, creates holes in the cell wall of some bacteria, so they lose water and die

3. Flagellum: It is a thread or hair like structure which serves the purpose of locomotion in the cells specially in bacteria, protozoa, spermatozoa etc. In bacteria, it helps in moving in the direction of food and moving away from inhospitable environment.

Hence, it can be correctly matched with e. responding to stimuli: move away from a less hospitable environment or towards a more hospitable environment.

4. Pilus: It is a hair like but rigid structure that protrude from the cell surface of the bacteria. It helps in the process of conjugation by forming a conncetion between cell surface of two bacteria.

Hence, it can be correctly matched with a. reproduction: exchanging genetic material in process of conjugation

5. Ribosomes: Ribosomes serve as the site of protein synthesis in the cell. Bacterial ribosomes are composed of two sub-units with sedimentary constant of 50S and 30S.

Hence, it can be correctly matched with c. maintaining homeostasis: protein is needed for enzymes and repairing structures

6. Cytoplasm: It is gel like material found within the cell (excluding nucleus in case of eukaryotes). All the metabolic activities of the cell generally take place in the cytoplasm of the cell.

Hence, it can be correctly matched with f. homeostasis: using energy, all chemical reactions are performed in the cytoplasm

4 0
2 years ago
Why is a shark considered a carnivore?
sattari [20]

Answer:

sharks cannot eat animals ..... shark can eat mamals and fishes

Explanation:

4 0
2 years ago
In some trees and shrubs, competition among seedlings causes individuals to be spaced relatively evenly throughout the habitat.
spin [16.1K]

Answer:

The correct answer is option D, that is regular or uniform.

Explanation:

The individuals in a population can be spaced in a distinct manner known as the dispersion patterns. The most common arrangement is the clumped dispersion in which these individuals are clustered together. In random dispersion, the individuals are aligned randomly, and in uniform or regular dispersion, the individuals are spaced evenly.  

The given case is an illustration of regular or uniform distribution. It is less common in comparison to clumped distribution. The pattern of uniform or regular distribution is witnessed in the populations of the species in which the distance between the adjacent individuals is enhanced. The requirement to enhance or increase the space between the individuals usually originates due to competition for a resource like nutrients or moisture.  

4 0
3 years ago
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