(Q).
Vein deposits of gold and silver are formed by igneous intrusion, and magma that cools slowly deep below the surface produces coarse-grained intrusive igneous rocks. Given these facts, when do vein deposits of gold and silver form among the following options: - When magma warms up - flow of electrons - it can be seen - permineralization - When magma cools - aqueous solution - When the air is cold - When water rises
(A).
When magma cools

(Q).
Antigens are molecules that the immune system recognizes as foreign to the body, and molecules are a group of atoms. Given these facts, what type of antigens does the immune system recognize as foreign to the body among the following options: - animals - epidermal - Allergies - negative - dangerous - graptolites - group of atoms - homogenous
(A).
group of atoms

(Q).
Some viruses have an envelope of phospholipids and proteins, and phospholipases are the enzymes that degrade phospholipids . Given these facts, what might have an envelope of proteins and enzymes among the following options: - fur seals - some viruses - Most plants - a fish - animal transport - animals - chickens - it needs them
(A).
some viruses