Explanation:
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Answer:
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B. gravitropism.
C. thigmatropism.
D. heliotropism.
Cells were first identified by Robert Hooke in 1665 when he observed the box-like structures in cork tissue under a microscope. In the 1670s, Antoine van Leeuwenhoek became the first to observe living cells. Both their work was instrumental to the understanding of cells and cell theory.
In 1665, experimental scientist Robert Hooke was the first to identify cells. He used the term 'cell' to describe the box-like structures he observed in a cork tissue using a lens, as documented in his publication Micrographic. Hooke's concept of a cell was based on his microscopic observation of the dead cork tissue. He likened the tiny subdivisions in the cork to the small rooms, or cells, that monks resided in.
Antoine van Leeuwenhoek, in the 1670s, became the first person to observe living cells, specifically bacteria and protozoa. Advances in lenses, microscope construction, and staining techniques throughout the years enabled the viewing of components within cells, further refining our understanding of cell structure and function.
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common ancestry
transitional evolution
similar mating habits
When homologous structures are found in different groups, an ancestry relationship can be stablished between them. Otion B. Scientists can attribute the structural similarities to common ancestry.
Fossils provide good information about the existing relationship between different groups,
The existing homologousstructures between these organisms might be relatively similar, suggesting a common origin.
These structures can show changes in the number of pieces composing them, their arrangement pattern, or their sizes and development degree. These differences reflect the changes that the groups suffered through evolution.
The pattern in which the composing pieces are arranged is useful to study the lineage evolution.
By looking at the structures' composition and arrangement, scientists can interpret how evolutive processes occurred.
Scientists can attribute the structural similarities to common ancestry.
You can learn more about common ancestry at