Why is dark matter difficult to measure? a) because it does not exist in our galaxy. b) because it disappears when it encounters ordinary matter. c) because it creates so much heat it melts any instruments invented so far. d) because it does not emit anything that current technology can detect

B) Because it disappears when it encounters ordinary matter.  

- Dark matter is very difficult to detect because they have almost no interaction with normal matter.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

starchy vegetables are high in carbohydrates.

starchy vegetables contain more carbohydrates than non-starchy vegetables.

explanation:

there are two primary categories of carbohydrates, essentially differentiated on the basis of their carbohydrate content (which is in the form of starch - a complex carbohydrate):

those vegetables which contain little amounts of starch are termed as non-starchy vegetables, and some examples include: artichokes, broccoli and bean sprouts.

vegetables high in their starch content are distinguished as starchy vegetables, and some examples include: potatoes, chickpeas and corn.