The blood get it's greatest pressure from the heart. The heart pumps the blood out.
Answer: the antibodies mistakenly identify the cells as foreign material
Explanation:
Explanation:
The oldest fossil evidence of seed plants is of Late Devonian age, and they appear to have evolved out of an earlier group known as the progymnosperms. These early seed plants ranged from trees to small, rambling shrubs; like most early progymnosperms, they were woody plants with fern-like foliage.
