Questions: Protozoans and algae, two categories of protists, can typically be distinguished A. nutrition B. habitat C. whether they are unicellular or multicellular D. method of reproduction Paramecia and amoebas are similar in that they are both Select all that apply. A. motile B. multicellular C. heterotrophic D. algae

To address the questions, let's analyze each part separately:

1. Protozoans and algae, two categories of protists, can typically be distinguished by:

   The answer is A: nutrition.

   • A. Nutrition: Protozoans are typically heterotrophic, meaning they obtain their food by consuming other organisms or organic matter. Algae, on the other hand, are generally autotrophic, meaning they produce their own food through photosynthesis.
   • B. Habitat: Both protozoans and algae can be found in similar habitats, such as aquatic environments, so this is not a distinguishing factor.
   • C. Whether they are unicellular or multicellular: Both protozoans and algae can be unicellular, and some algae can also be multicellular, so this is not a reliable distinguishing factor.
   • D. Method of reproduction: Both groups can reproduce asexually and sexually, so this is not a distinguishing factor.

2. Paramecia and amoebas are similar in that they are both:

   The correct answers are A: motile and C: heterotrophic.

   • A. Motile: Both paramecia and amoebas are capable of movement. Paramecia move using cilia, while amoebas move using pseudopodia.
   • B. Multicellular: Both paramecia and amoebas are unicellular organisms, so this option is incorrect.
   • C. Heterotrophic: Both organisms obtain their nutrients by consuming other organisms or organic matter, making them heterotrophic.
   • D. Algae: Neither paramecia nor amoebas are classified as algae; they are protozoans, so this option is incorrect.

In summary, protozoans and algae are typically distinguished by their nutrition, and paramecia and amoebas are similar in being motile and heterotrophic.