The alga powellsia pikocensis is typically a unicellar species. occasionally it is multicellular; clusters of cells have been found in arsenic-rich hotsprings in western montana and wyoming. it has been determined that clusters form because cells undergoing reproduction fail to separate. you are interested in whether natural selection can act on cell clusters rather than on individual cells. which of the following statements would support the hypothesis that clusters are capable of evolution? a. clusters reproduce by breaking off pieces to form smaller clusters b. larger clusters are more homeostatic than smaller clusters c. clusters reproduce less frequently than single cells d. single cells are more abundant than clusters d. all of the above

The correct answers are statements a and b.

Explanation:

The clusters of cells can exhibit the capability of evolution if it fits into three conditions, that is, possessing the tendency of reproducing, variation in clusters and that variation need to be hereditary, and the clusters shall pass fitness, that is, clusters must be abundant in comparison to the single cells.  

The given first statement indicates that clusters possess the tendency to reproduce by the process of fragmentation. Thus, it supports the hypothesis that the clusters possess the tendency to evolve. The second statement indicates that clusters are more fit, therefore, it also supports the hypothesis.  

The third statement is contrary to the hypothesis. Therefore, it does not support the hypothesis. The fourth statement is in contrast to fitness, more abundancy shows more fitness. Therefore, it also does not support the hypothesis. Hence, the correct statements are a and b.  

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.