Agroup of students performing an experiment collect euglena samples from a pond and keep them in darkness in a vessel containing pond water
which would be the conclusion for this experiment? a) the euglena cells remain alive because they are completely heterotrophic
and feed on the organic matter present in the pond water. b) the euglena cells die because they are completely autotrophic
in nature and are unable to create food in the absence of sunlight.
c) the euglena cells, which are both autotrophic and heterotrophic, remain alive even in the absence of sunlight because
they can feed upon the organic material present in the pond water.

Every compound can be represented by a chemical formula. a chemical formula is the set of symbols showing the elements that make up a compound and their proportions. water’s chemical formula is h 2 2 o. that means a molecule of water contains two atoms of hydrogen and one atom of oxygen chemically bonded. a molecule is a group of two or more atoms bonded together. molecules can range in size from two to thousands of atoms. a molecule of a compound is the smallest unit of that compound. every molecule of water has all the physical and chemical properties of water. that’s because every molecule of water is made of the same elements in the same proportions: two hydrogen atoms and one oxygen! which of the following is a true statement? a every molecule of the same compound will have different properties. b every molecule of a compound has the same proportion of elements. c molecules can be physically separated into smaller units of a compound. d molecules cannot be represented by chemical formulae.

Asmall number of finches are removed randomly from the wild and placed in a protected bird area. they are given as much food as they need and have plenty of space. why would natural selection not occur in this population? a. there is no reason for genetic mutation to occur. b. the birds compete for limited resources, c. the population has not reached carrying capacity. d. there is no genetic variation in the finches.

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels