Heterocyst-forming cyanobacteria differentiate highly specialized cells to provide fixed nitrogen to the vegetative cells in a filament. In the presence of a source of combined nitrogen such as nitrate or ammonium, Anabaena PCC 7120 grows as long filaments containing hundreds of photosynthetic vegetative cells.
Answer:
one common ancestor
Explanation:
Although Darwin’s theory is often described as the theory of evolution by natural selection, most commentators recognize that common ancestry (the idea that all organisms now alive on earth and all present day fossils trace back to one or a few “original progenitors”) is an important part of the Darwinian picture.
Answer:
Là những biến đổi số lượng xảy ra ở một hoặc một số cặp nhiễm sắc thể hoặc toàn bộ nhiễm sắc thể của mỗi loài. Đột biến nhiễm sắc thể bao gồm 2 loại:
+ Đột biến cấu trúc nhiễm sắc thể.
+ Đột biến số lượng nhiễm sắc thể.
Explanation:
Answer:
The answer to this question is false
Answer: Conclusion
Explanation:
Scientific method can be defined as a detailed plan for conducting research in a particular scientific domain. This is used to give scientific explanation for natural phenomena. In scientific method a hypothesis is created, observation is made, experimentation is conducted and then finally a conclusion is made to address the hypothesis.
Therefore, after the research is completed the conclusion is made by analyzing all the facts related to the literature and results of the experiments.
