Answer:
<u>stonewort, and many green algae such as the Spirogyra.</u>
Explanation:
- As it was believed that the land algae were believed to be evolved from the stonewort plant and the blue-green algae like the cyanobacteria and the spirogyra that colonized the lands some 500 mn years ago was a freshwater alga.
- After which the first land plants occur about 470 million years ago, and they were in the form s of moss and liverworts of the vascular in origin.
The correct option is B.
Erosion refers to the gradual removal and destruction of the earth surface by agents such as water and wind. Water erosion, especially fast moving water is a greater force of erosion than wind erosion because it has greater energy and therefore can cause more damages.
Answer:
Gills, Scales, swim bladder, and backbone.
Explanation:
Eutrophication is the input of excessive nutrients into fresh surface waters. Nutrients can cause algal blooms. Some of these algae can be toxic, and algal death can also result in anoxic conditions, leading to fish deaths. Some indicators of eutrophic conditions can be high measures of important nutrients such as phosphates and nitrates. Another indication of eutrophication can be high concentrations of algal cells. Finally, low dissolved oxygen can indicate eutrophic conditions.
Answer:
There are two major forms of cell death, designated apoptosis and necrosis, with the former being the most common cell death pathway. Since apoptosis is a result of tightly regulated, genetically controlled, self-orchestrated processes, it is often referred to as programmed cell death (PCD).
Explanation:
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