Cacti and other succulents can adapt to dry climates. They are able to store water in their leaves, while others store water in the roots or trunks. The waxy cuticle helps prevent water loss.
Plants store their sugar in the form of starch
Hair and nails are part<span> of the integumentary </span>system<span>.</span>
The correct answer to this question is this one: they lacked oxygen. The earliest organisms were completely heterotrophic in nature because of the reason that they lacked oxygen. <span>A heterotroph is an organism that cannot fix carbon and uses organic carbon for growth. </span>
D- The digestive system breaks down your food and your circulatory system takes it throughout your body