Which of the below organisms does not have a cell wall as part of their structure? a. oak tree b. salmonella bacteria c. seaweed d. turtle

Ageologist determines that a sample of a mineral cant be scratched by a steel nail but can be scratched by a masonry drill bit based on this information the sample mineral has to be softer than

Can someone i have no idea of how to do this.

Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals