When problems with blood forming tissue are suspected, clinicians obtain tissue samples from the because the red bone marrow in this location is highly active in hematopoiesis.

Hip Bone

Explanation:

Hematopoiesis is a semi-solid tissue which is found in the cancellous or spongy portions of the bones.

In adult human, bone marrow is found in many bones of the body such as in the sternum, ribs and  bones of pelvis. On an average the 4 % of the whole body mass is bone marrow.

In case of any blood forming tissue problem the tissue sample are usually extracted from the pelvic bone because this is one of the actively participating regions in the body of adult.

hence, the correct answer is hip bone.

Hip bone.

Explanation:

The hematopoiesis is the process of formation of blood cells that are found in the spongy or cancellous portion of the body. Around  10¹¹–10¹² cells are produced daily in the body by hematopoiesis.

The bone marrow of adult human consists of the pelvis bones, ribs and sternum. The bone marrow includes the 4-5% body mass. The tissue are extracted from the pelvic or hip bone because this region actively participates in hematopoiesis.

Thus, the answer is hip bone.

answer;

c. a tree whose roots are surrounded by wet sand.

explanation;

water stress is an important factor limiting the growth and productivity of forests.water stress is the most often cited cause of poor survival and growth of woody landscape plants.

-insufficient soil moisture is the most common form of water stress, but excess moisture that leads to poor soil aeration (hypoxia) can also result in reduced plant vitality. a tree whose roots are surrounded by wet sand would be least likely to experience water stress.