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Answer 1

Answer:

In higher forms of organisms such as vertebrates (including humans), the biological systems include integumentary system, lymphatic system, muscular system, nervous system, reproductive system , respiratory system, skeletal system, endocrine system, immune system, and urinary system.

Answer 2

Solution :

$\begin{gathered}x + \: 10 \: + \: 20 = 100 \\ \\ \end{gathered}$

$\begin{gathered}x \: + \: 30 = 100 \\ \\ \end{gathered}$

$\begin{gathered}x = 100 - 30 \\ \\ \end{gathered}$

$\begin{gathered}x = 70 \\ \\ \end{gathered}$