Q: What was diorite commonly used for in ancient civilizations? Read this paragraph and choose the correct option from the provided answers: An example of a physical model is a drawing of the layers of Earth ( Figure below ). A drawing helps us to understand the structure of the planet. Yet there are many differences between a drawing and the real thing. The size of a model is much smaller, for example. A drawing also doesn't give good idea of how substances move. Arrows showing the direction the material moves can help. A physical model is very useful but it can't explain the real Earth perfectly. Choices: - school - currency - medicine - art A:
art

Q: What is the study of how living organisms interact with each other and with their environment? Read this paragraph and choose the correct option from the provided answers: Recall that ecology is the study of how living organisms interact with each other and with their environment. But how do organisms interact with each other? Organisms interact with each other through various mechanisms, one of which is competition. Competition occurs when organisms strive for limited resources. Competition can be for food, water, light, or space. This interaction can be between organisms of the same species (intraspecific) or between organisms of different species (interspecific). Choices: - botany - zoology - genetics - ecology A:
ecology

Q: What are embedded in the membranes of b cells and bind a variety of antigens through their variable regions? Read this paragraph and choose the correct option from the provided answers: Figure 42.13 B cell receptors are embedded in the membranes of B cells and bind a variety of antigens through their variable regions. The signal transduction region transfers the signal into the cell. Choices: - b.a.p cell receptors - a.m. cell receptors - er cell receptors - b cell receptors A:
b cell receptors