Why do plant cells not need centrioles for mitosis or meiosis?

Describe two recent or ongoing space missions.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Diabetes is often suspected when glucose shows up in urine tests. use the model to explain how glucose could be present in urine. why do you think this symptom is especially concerning for young people?