Answer:
Metric ruler
Explanation:
You need to measure length, which is exactly what a ruler measures. The other option measure other things, like liquids or temperature.
Because it’s time consuming and money consuming to observe from space so models are required
And: Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins. Some molecules and ions such as glucose, sodium ions, and chloride ions are unable to pass through the phospholipid bilayer of cell membranes.
well I mean I don't know a lot but, Yes, a physician can proceed with diagnosis of a disease based on molecular biology data. It would have been easier to explain if you had shared the data with us. Molecular Biology techniques like polymerase chain reaction (PCR) is widely used for diagnostic purposes.