A(n) is an ecosystem that is covered with water for least part of the year
streak is the color of a minerals powder.
most minerals occur in more than one color
steak is tested by scraping a mineral across a streak plate
im pretty sure but it would be better to wait for someone who knows what theyre talking about to answer-
erythrocytes, also known as red blood cells (rbcs)
leukocytes, also known as white blood cells (wbcs)
the answer is a or when it says crossing over