Which of the following structures does a fern have, but a flatworm and a human don't? (points : 1) mitochondria nucleus chloroplasts dna

*will mark brainliest to the first and correct answer less species diversity results in less a. oxygen b. food c. drinkable water d. all of the above

Why is excretion necessary to maintain homeostasis?

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back