(Originais Teachy 2023) - Question Very Easy of Biology

The excreta produced by animals also help maintain environmental health as they serve as a source of nutrients for other living beings present in the animal's environment, thus contributing to the naturally established food chain in that ecosystem. What is the main function of these excreta in this context?

Protozoans are single-celled eukaryotes that can be found in various aquatic and terrestrial environments, and some are known to cause serious diseases in both humans and animals. In a hypothetical scenario, a group of researchers discovered a new species of protozoan in a contaminated water sample. The researchers also found that this species has the ability to photosynthesize and can be classified as an alga as well. Consider the characteristics of this new species and the information about the diseases caused by protozoans, and answer the following questions: 1) Discuss the morphological and physiological features that allow this new species to be classified as both a protozoan and an alga. 2) Propose a potential mechanism by which this species could contribute to the spread of infectious diseases, considering its dual classification and the characteristics of known disease-causing protozoans. Your answer should integrate knowledge of both biology and environmental science, highlighting the interdisciplinary nature of understanding and addressing issues related to infectious diseases and environmental contamination.

Various parts of the human body have specific receptors for some type of tactile stimulus, such as the hands and feet. The tactile receptors present in the hands are called Meissner's corpuscles, while those present in the feet are known as Ruffini's corpuscles. What are the main functions of these corpuscles?