Question Select the 2 correct statements that describe cyanobacteria.(1 point) Responses Cyanobacteria have complex cells containing a nucleus Cyanobacteria have complex cells containing a nucleus Cyanobacteria were the first photosynthesizing organisms Cyanobacteria were the first photosynthesizing organisms Cyanobacteria decreased the levels of oxygen in the atmosphere Cyanobacteria decreased the levels of oxygen in the atmosphere Cyanobacteria lived in the ocean
The correct statements that describe cyanobacteria are:
1. Cyanobacteria were the first photosynthesizing organisms
2. Cyanobacteria lived in the ocean
The two correct statements that describe cyanobacteria are:
1. Cyanobacteria were the first photosynthesizing organisms.
2. Cyanobacteria lived in the ocean.
To answer this question, we need to evaluate each statement individually and determine if it is true or false.
Statement 1: Cyanobacteria have complex cells containing a nucleus.
Explanation: To determine if this statement is true, we can recall our knowledge of cyanobacteria. Cyanobacteria are a type of bacteria that have prokaryotic cells, which means they do not have a true nucleus. Instead, their genetic material is located in a region called the nucleoid. Therefore, this statement is false.
Statement 2: Cyanobacteria were the first photosynthesizing organisms.
Explanation: To determine if this statement is true, we can analyze the history of photosynthesis. Cyanobacteria appeared around 2.7 billion years ago and are considered to be some of the earliest organisms that could carry out photosynthesis. They played a significant role in increasing the levels of oxygen in the Earth's atmosphere through photosynthesis. Therefore, this statement is true.
Statement 3: Cyanobacteria decreased the levels of oxygen in the atmosphere.
Explanation: To determine if this statement is true, we need to recall our knowledge of cyanobacteria and their role in the atmosphere. Cyanobacteria actually had the opposite effect. They contributed to the increase in oxygen levels in the atmosphere through their ability to produce oxygen as a byproduct of photosynthesis. Therefore, this statement is false.
Statement 4: Cyanobacteria lived in the ocean.
Explanation: To determine if this statement is true, we can recall our understanding of cyanobacteria's habitat. Cyanobacteria are found in a wide variety of environments, including terrestrial, freshwater, and marine ecosystems. They are commonly found in water bodies, including oceans. Therefore, this statement is true.
Based on the explanations above, the two correct statements that describe cyanobacteria are:
- Cyanobacteria were the first photosynthesizing organisms.
- Cyanobacteria lived in the ocean.