Match these items. 1. liquid part of blood —— cells
2. factory for red blood cells —— bone marrow
3. building blocks of tissues —— pulse
4. molecule that carries oxygen in the blood —— hemoglobin
5. smallest blood vessel plasma
6. heart chamber —— ventricle
7. heart contractions —— capillary

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.