A scientist is at the hospital visiting a friend's young daughter, who has been
diagnosed with a respiratory virus. On his way out, he speaks with a nurse
and discovers that the pediatric wing of the hospital was recently converted
into a respiratory disease unit due to the recent rise in respiratory infection.
The scientist realizes that respiratory disease is a serious problem. The
scientist is in which part of the engineering process?
A. Making a plan
B. Doing the plan
C. Knowing the background
D. Identifying a need

D.

Explanation:

Identifying a need.

they are made of gases.

they have a spherical shape.

they make energy through fusion.

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.