Answer:
(B) resemble structures formed by bacterial communities that are found today in some shallow marine bays.
Explanation:
Extant stromatolites represent real "living fossils" for they are decendents of ancient forms that are associated with one of the first living forms on earth. Particularly, stromatolites are real bacteria communities where the autotrophic organism of the community are represented by cyanobacteria, which live along with heterotrophic bacteria. This clearly indicates that fossilized stromatolites points to bacteria (prokaryotes) as the first living things on earth (dated with not less than 3.5 billion year old)
Nowadays, stromatolites with cyanobacteria allows to reconstruct and understand fossilized forms. These current structures live in shallow marines ambients (e.g. Australia) but also in continental salt flats (e.g. Argentina) where few others bacteria can survive to these extreme conditions (high light exposure and salt concentration).
Answer:
nucleus
The function of the nucleus is to regulate gene expression, including controlling which proteins the cell makes. In addition to DNA, the nucleus contains a thick liquid called nucleoplasm that is similar in composition to the cytosol found in the cytoplasm outside the nucleus
Explanation:
Answer:
The correct answer is option A.
Explanation:
The lymph node is a small bean-like structure that filters substances that move through the lymphatic pathway with the lymphatic fluid. Lymph nodes are present on different site in the human body. They contain white blood cells that soldiers of the human immune system and fight with infection and pathogens.
Immune system cell that is B and T cells both, not just located in the cortex only but medulla of lymph nodes.
Thus, the correct answer is option A.
Salt marshes are diverse ecosystems because there are resources from both
An organism's niche includes the type of food it eats, how it obtains its food, and what its predators are. Here is a quizlet website that has more answers to questions like this one: https://quizlet.com/81207203/section-4-2-review-flash-cards/
Your answer is: Niche
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