The outermost extraembryonic membrane that contributes to the formation of the placenta is the: MCQ with Answer and Explanation

Explanation:
Thiamine pyrophosphate (TPP), derived from vitamin B₁, is a cofactor for pyruvate dehydrogenase, which catalyzes the oxidative decarboxylation of pyruvate to acetyl-CoA. Riboflavin is FAD, niacin is NAD, pyridoxine PLP for transamination.

Explanation:
Robert Brown, a Scottish botanist, discovered and named the nucleus in 1831 while studying orchid epidermal cells. Hooke coined 'cell', Schleiden and Schwann formulated cell theory. Brown's observation was pivotal.

Explanation:
Robert Hooke, in 1665, observed dead cork tissue under a microscope and coined the term 'cell' for the box-like structures he saw. Antonie van Leeuwenhoek, using his superior single-lens microscopes in the 1670s, was the first to observe and describe living microorganisms, including bacteria and protozoa. Charles Darwin proposed the theory of evolution by natural selection; the cell theory was proposed by Matthias Schleiden and Theodor Schwann. Thus, statements 1 and 2 are correct.