Which disturbance would result in primary succession? A. harvesting wheat by using a combine harvester at the end of the growing season B. controlled burning to stimulate the growth of forest trees such as sequoia C. the formation of Surtsey, a volcanic island off of the southern coast of Iceland D. the effect of a large herd of elephants on the grasses and shrubs in an area

Answers

Answer 1

Answer: The formation of Surtsey, a volcanic island off of the southern coast of Ireland. By definition, primary succession refers to when the structure of an ecosystem changes drastically in such a way that it can no longer support organisms. In this case of ecological succession, the formation of the volcanic island creates a new habitat that is unpredicted and is not influenced by any existing ecosystems.

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How does the structure of the stigma aid in pollination?

Answers

The top of the stigma is sticky, and the pollen attatches to it, making it easier for bees to get it.

Final answer:

The structure of the stigma aids in pollination by being specifically designed to capture and trap pollen. It is sticky or feathery, allowing it to collect pollen efficiently when a pollinator visits the flower. The specific structure also helps prevent pollination from different species, thus maintaining species purity.

Explanation:

The structure of the stigma greatly aids in pollination because it is specifically designed to capture and trap pollen. The stigma is the top part of a flower's carpel, and it has a sticky or feathery surface that enables it to collect pollen efficiently. When a bee or another pollinator visits a flower, the pollen sticks to its body and is transferred to the stigma of the next flower it visits. This transfer process, facilitated by the structure of the stigma, is known as cross-pollination.

The precision of the stigma's structure in different species also aids in the prevention of unwanted pollination from different species, helping in maintaining the purity of the species. Thus, the structure of the stigma plays a crucial role in the plant reproduction process.

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What are the functions of micronucleus and macronucleus in paramecium?

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The macronucleus is the larger elipse-shaped nucleus and takes care of functions like respiration and digestion. In contrast to this, the smaller micronucleus is only involved in cell division or reproduction.

Answer: the micro nucleus regulates the vegetative functions in the macro nucleus regulates reproduction in paramecium.

Explanation:

PLEASE HELP! IM DOING A TEST!!
What do Vaccines do?

Answers

Vaccines train our immune systems to create proteins that fight disease, known as antibodies’

Answer: vaccines help to protect us from a disease by giving our immune system a sample so that when the real disease comes, your body will be ready to fight it off.

Explanation:

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The law of conservation of momentum states that the total momentum of a system _____.-increases
-decreases
-remains constant

Answers

The law of conservation of momentum states that the total momentum of a group of objects does not change unless outside forces act on the objects.

The correct answer is remains constant.

The law of conservation of momentum can be stated as in an isolated system when any collision between two bodies takes place then the the total momentum remains constant. This law has been derived from the Newton's law of motion. The collision of body transfers its energy from body A to another body B.

Hence, in this way the total momentum remains constant.

The atmosphere that we depend on for our survival is enriched by numerous cyanobacteria. This fact justifies which characteristic of cyanobacteria

Answers

A. Cyanobacteria are photoautotrophs.

A(n) _______ is a characteristic arising from genes located on chromosomes that are not gender-determining.A. genotype
B. allele
C. sex-linked trait
D. autosomal trait

Answers

The correct answer is D. Autosomal chromosome.

An autosomal chromosome is a characteristic which arises from genes which are located in the chromosomes that are not gender-determining. The autosomal trait does not depend on sex.
Its function is to pass genetic traits from mother and father to the child. Traits can be recessive or dominant. When someone has green eyes we say he/she is recessive trait and not dependent on the sex of the child.
In each cell, people have 22 pairs of autosomes plus two sex chromosomes which Y and X in male and XX in the female.

Out of the following choices, an autosomal trait is a characteristic arising from genes located on chromosomes that are not gender-determining.

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Two important steps involved in genetic engineering are cutting the desired gene from its genome, then cutting the vector genome and pasting the gene into it.How is this carried out? Select one of the options below as your answer:A.Using the same restriction enzyme for cutting the desired gene and the vector and using ligase for pasting the gene into the vectorB.Using two different restriction enzymes for cutting the desired gene and the vector and polymerase for pasting the gene into the vectorC. Using the same ligase for cutting the desired gene and the vector and a restriction

True or falce in a particular envionment two species can usually occupy the same niche

Which of the following statements about homologous chromosomes is correct?a. Each gene is at the same locus on both chromosomes. b. They are two identical copies of a parent chromosome which are attached to one another at the centromere. c. They always produce identical phenotypes. d. They are chromosomes that have identical genes and alleles.

Fossils of the first animals are rare because theyA. were large and likely to be eaten by others after they died. B. lived only in volcanic regions, and were destroyed by lava flows. C. were soft-bodied and tiny, therefore unlikely to fossilize. D. had hard shells that broke down easily, leaving no trace