Which two types of matter are chemical pure substances

How would you find the mass of a metal cube btw Im talking about kilo hecto deka Deci centi milli

A child is admitted in the clinic with nausea, vomiting, constipation, hypophosphatemia, and glycosuria. after talking to the parents, the nurse learns that they are painting the house.

Vascular plants have two main organ systems. what are they

Wich is an, example of bottleneck effect

Bacteria die when refrigerated or frozen

One source of groundwater pollution is pesticide runoff from crop fields. How could artificial selection be used to address this problem? A. Farmers select plants that are most resistant to pests, which reduces the need for pesticides. B.

The trp operon in E. coli regulates genes that code for enzymes required for synthesis of the amino acid tryptophan. the trp operon is repressible operon.

Nylon fiber is classified under which one of these headings? A. Protein B. Polyurethane C. Polyester D. Polyamide

What cells were chloroplast present in? What did they look like in the various cells?

Enzymes are part of chemical or mechanical