For example, an individual can be AB, D positive, and at the same time M and N positive (MNS system), K positive (Kell system), Lea or Leb negative (Lewis system), and so on, being positive or negative for each blood group system antigen.
Nearly every list of easy-to-grow vegetables starts with lettuce, and with good reason: so long as you plant it at the right time, it will grow from seed with little attention. The right time is when the soil is cool, in the spring and fall. In Arkansas, you can plant lettuce seeds from February to April, and again in September for a fall harvest.
Timing of Planting. Transplant tomatoes only after the danger of spring frosts has fully passed. Seeds can be started indoors eight to 12 weeks before this last expected frost date. In southeastern Texas, it is possible to transplant tomatoes in late summer about 100 days before the expected first fall frost date. The opportune time for tomatoes is when temperatures are between 75 and 85 degrees during the day and between 60 and 70 degrees at night.