A student is observing different structures of a seed plant during a lab activity. She has identified tiny structures that look like powder.

Angiosperms

Explanation:

Since we know that the student is observing a Seed Plant then we can determine that what she is observing are Angiosperms. These are plants with seeds, whose main characteristic is the reproduction with seeds, as well as having pollen grains on the flowers. These pollen grains are the tiny structures that look like powder which the student has identitfied.

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah