How do scientists know that the first organisms were simple, unicellular organisms

Which statement describes a way in which the digestive and excretory systems work together? A. The nephrons absorb nutrients from food going to the large intestine. B. The excretory system balances blood gases in the small intestine. c.

What conditions and raw materials are necessary for photosynthesis to occur

Which of the following is the correct increasing order of chromosome organization?

Saddle joints have concave and convex surfaces. Name the two bones of the hand that articulate to form a saddle joint. A. The trapezium of the carpal bone and the thumb's metacarpal. B.

What are all the things that can be used to produce bio gas

3. Which of the following is the term for the energy of motion? 1) potential energy 2) kinetic energy 3) tension 4) momentum

Describe the process through which allopatric speciation splits 1 species into 2 distinct ones

What is an example of a limiting factor that humans use to control the carrying capacity of an environment for a particular type of organism? Explain your answer.

How does natural selection support the theory of evolution? A. Natural selection explains how the changes in life forms that evolve over millions of years take place over shorter periods of time. B.

Example of wave amplitude