**Acknowledgements**

The author wish to greatly acknowledge the National Commission on Research, Science and Technology (NCRST) for the financial support with the Swakara Project.

#### **Author details**

Theopoline Omagano Itenge University of Namibia, Windhoek, Namibia

\*Address all correspondence to: tamushendje@unam.na

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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