Type ___ blood is the universal donor. Type ___ blood is the universal recipient.

1) Type O blood is the universal donor.

People with type O- blood are called universal donors because their donated red blood cells have no A, B or Rh antigens and can therefore be safely given to people of any blood group

2) Type AB blood is the universal recipient .

AB positive blood type is known as the “universal recipient” because AB positive patients can receive red blood cells from all blood types.7

Hope this helps . Please mark as brainliest.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.