Ectotherms are more common in some ecosystems than in others. Where are ectotherms the LEAST common, and for what reason?
a. a very cold ecosystem, because they would lose too much body heat
b. a hot, dry ecosystem, because they would overheat without a steady supply of water
c. a hot, rainy ecosystem, because they depend on dry surfaces to maintain body temperature
d. an aquatic ecosystem, because they would lose too much heat to the 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.

Amouse that is homozygous for the dominant trait has the genotype . it has . a mouse that is homozygous for the recessive trait has the genotype . it has . image of fur color of mice

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation