Lazzaro Spallanzani is famous for his experiments that disproved the theory of spontaneous generation (abiogenesis), not for approving it. He demonstrated that microorganisms do not grow in boiled broth if the container is sealed, providing evidence for biogenesis. The other pairings correctly associate scientists with their respective contributions to the chemical evolution of life.

Neo-Lamarckism is a modified version of Lamarck's original theory. It emphasizes that environmental factors directly influence the organism, leading to adaptive changes. Unlike strict Darwinism, it suggests that the interaction between the environment and the organism is the primary driver of evolutionary change, often focusing on the physiological and developmental responses to environmental stress rather than just random mutation.

Organic evolution refers specifically to the change in the heritable characteristics of biological populations over successive generations. While chemical and stellar evolution describe changes in non-living systems, biological evolution is the standard scientific term for the development of life forms.

Jean-Baptiste Lamarck proposed the theory of 'use and disuse,' suggesting that organs used frequently become stronger, while those not used degenerate and eventually disappear. He used the loss of limbs in snakes as a classic example of this mechanism. While modern evolutionary biology relies on natural selection and genetic mutation, this question specifically references the historical Lamarckian perspective on organic evolution.

Darwin is associated with the HMS Beagle voyage (a-3). Genetic drift is often linked to the founder effect (b-4). Mutations in germ cells are heritable (c-1), meaning they can be passed to the next generation. Conversely, mutations occurring in somatic cells are not inherited by offspring (d-2) because they do not affect the gametes.

Lamarckism posits that organisms acquire traits through use or disuse and pass these to offspring. The absence of limbs in snakes, webbed toes in aquatic birds, and lack of pigment in cave animals were historically interpreted as results of environmental influence and habit. While modern genetics refutes this, these examples remain the classic illustrations used to explain Lamarck's hypothesis in historical biological contexts.

In 1858, the joint papers of Charles Darwin and Alfred Russel Wallace, outlining the theory of evolution by natural selection, were read at a meeting of the Linnean Society of London and subsequently published in the Society's journal. This event marked the formal introduction of the theory to the scientific community before Darwin published his more comprehensive work, 'On the Origin of Species', in 1859.

Charles Darwin is the primary figure associated with the theory of evolution by natural selection, as detailed in his seminal work, 'On the Origin of Species'. While Alfred Russel Wallace independently conceived the theory, Darwin's extensive evidence and publication established him as the central proponent.

Darwin's theory posits that populations produce more offspring than can survive (overproduction), leading to competition for resources (struggle for existence). Individuals with favorable variations are more likely to survive and reproduce (survival of the fittest), passing those traits to the next generation.

Lamarckism proposes that environmental changes drive evolutionary form, organs develop based on urgent needs, and the use or disuse of organs leads to physical changes. Statement 4 describes Darwin's principle of overproduction, which is not a core tenet of Lamarck's theory of inheritance of acquired characteristics.