Answer:
Microscopes
Explanation:
cells were seen on the microscope.
Answer:
A. humans going underwater and exhaling
Explanation:
The dissolved oxygen in water refers to the amount of oxygen that is found in water. However, there are various ways that oxygen dissolves in a body of water, these includes;
- Photosynthesis of aquatic plants: Oxygen is the waste product of the photosynthetic process carried out by green plants. Hence, when aquatic plants undergo photosynthesis, oxygen from them tend to dissolve into water.
- Diffusion from the atmosphere: Oxygen from air or atmosphere also dissolves in water
- aeration as water moves over rocks and debris, and from wind and waves
However, humans do not exhale oxygen but carbon dioxide, hence, it is not a source of dissolved oxygen
Answer:
Chromatin
Explanation:
The DNA, which is the genetic material in virtually all living cells is found in a long chain of polynucleotides. This long nature of the DNA will prevent it from fitting into the nucleus of eukaryotic cells. Hence, the cell devises a way to make this work by forming a structure called CHROMATIN.
Chromatin is formed when the long DNA molecule wraps around a set of proteins called HISTONE. Histones bind to the DNA molecule, which could are the core of the proteins to form a NUCLEOSOME structure. Each nucleosome is the basic unit of Chromatins. This nucleosome undergoes further coiling to form the CHROMATIN, which eventually forms the chromosomes the genetic material is transferred as in the nucleus.