Answer:
Pulmonary arteries carry the blood to your lungs, where it receives oxygen. Pulmonary veins move the blood oxygen-rich blood to the left side of your heart.
Answer:
A test cross may be used to help work out the genotype of a black mouse.
Explanation:
Due to technical problems, you will find the complete answer and explanation in the attached files
In handling a pyridinium tribromide it should be avoid
formation of dust and aerosols, then the handler should provide correct exhaust
ventilation at the places or areas where dust is formed and it is a normal
measures for preventive fire protection. And in storage it must be keep in a
tightly closed container in a dry area.
Answer:
C) The continents were once connected.
Explanation:
All the continents were once part of the super-continent called Pangaea. Continental drift split it into fragments and led to the formation of the present-day continents. Since all the continents were connected, some of the cacti native to tropical western Africa must have been carried to present-day America.
The cacti populations present in America and tropical western Africa accumulated genetic variations to get adapted to the prevailing environmental conditions. Separation of continents by continental drift led to their geographical isolation and prevented any interbreeding between the populations. Over generations, the cacti present in two continents evolved into separate species.
