Q: Q: Billions of what inside the human digestive tract help us digest food, make vitamins and play other important roles? Read this paragraph and choose the correct option from the provided answers: There are billions of bacteria inside the human digestive tract. They help us digest food. They also make vitamins and play other important roles. We use bacteria in many other ways as well. For example, we use them to:. Choices: - neurons - viruses - red blood cells - bacteria A:
A: bacteria

Q: Q: The fungus benefits from the constant supply of food produced by what? Read this paragraph and choose the correct option from the provided answers: A lichen is a mutualistic relationship between a fungus and a photosynthetic organism. The other organism is usually a cyanobacterium or green alga. The fungus grows around the bacterial or algal cells. The fungus benefits from the constant supply of food produced by the photosynthesizer. The photosynthesizer benefits from the water and nutrients absorbed by the fungus. Figure below shows lichen growing on a rock. Choices: - the host - the spermatophyte - the phytoflagellate - the photosynthesizer A:
A: the photosynthesizer

Q: Q: Australia is home to many endemic species. the (a) wallaby (wallabia bicolor), a medium-sized member of the kangaroo family, is a pouched mammal, or this? Read this paragraph and choose the correct option from the provided answers: Throughout Chemistry, you will find features that draw the students into scientific inquiry by taking selected topics a step further. Students and educators alike will appreciate discussions in these feature boxes. Chemistry in Everyday Life ties chemistry concepts to everyday issues and real-world applications of science that students encounter in their lives. Topics include cell phones, solar thermal energy power plants, plastics recycling, and measuring blood pressure. How Sciences Interconnect feature boxes discuss chemistry in context of its interconnectedness with other scientific disciplines. Topics include neurotransmitters, greenhouse gases and climate change, and proteins and enzymes. Portrait of a Chemist features present a short bio and an introduction to the work of prominent figures from history and present day so that students can see the "face" of contributors in this field as well as science in action. Choices: - primate - placental - rodent - marsupial A:
A: marsupial

Q: Q: In what century was the microscope invented? Read this paragraph and choose the correct option from the provided answers: 7.2 History of cell knowledge The optical microscope was first invented in 17th century. Shortly thereafter scientists began to examine living and dead biological tissues in order to better understand the science of life. Some of the most relevant discovery milestones of the time period include: The invention of the microscope11 , which allowed scientists for the first time to see biological cells Robert Hooke12 in 1665 looked at cork under a microscope and described what he called cork "cells" Anton van Leeuwenhoek13 called the single-celled organisms that he saw under the microscope "animalcules" Matthias Jakob Schleiden14 , a botanist, in 1838 determined that all plants consist of cells Theodor Schwann15 , a zoologist, in 1839 determined that all animals consist of cells Rudolf Virchow16 proposed the theory that all cells arise from previously existing cells In 1838, the botanist Matthias Jakob Schleiden and the physiologist Theodor Schwann discovered that both plant cells and animal cells had nuclei. Based on their observations, the two scientists conceived of the hypothesis that all living things were composed of cells. In 1839, Schwann published 'Microscopic Investigations on the Accordance in the Structure and Growth of Plants and Animals', which contained the first statement of their joint cell theory. Choices: - 20th - 16th - 15th - 17th A:
A: 17th