Which of the following are positively charged? 1. The proton
2. The electron
3. The alom
4. The nucleus
A) 1 and 2
B) 2 and 3
C) 3 and 4
D) 1 and 4

Abnormal softening of a gland is known as

Which of the following is a macronutrient? carbohydrates lipids amino acids all of the above

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they