Match the following circulatory systems with the correct animals.

1. closed circulatory system

2. two-chambered heart

3. four-chambered heart

a) fish b) earthworm c) birds

Climate is described as what

A codon Question 6 options: corresponds to a particular amino acid. consists of four nucleotides. consists of discrete amino acid regions. catalyzes RNA synthesis.

Which two of these characteristics are examples of endoskeletons? scales in fish bones in mammals calcium-rich plates in echinoderms appendages in arthropods

In glycolysis, fructose-1,6-bisphosphate is converted to two products with a standard free-energy change (ΔG°') of 23.8 kJ/mol.

Which of the following bases is used in RNA but not DNA? a. adenine b. thymine c. uracil d. guanine

In the F2 generation of Mendel's crosses, A. all plants had the dominant trait. B. half of the plants had the dominant alleleC. all plants had both the dominant and recessive alleles. D. one in four plants had two alleles for the recessive trait.

In a population, when the birthrate becomes higher than the death rate, the population's growth rate A) decreases. B) increases. C) slows to a stop. Eliminate D) levels off and remains constant.

Types of calcareous marine microorganisms

Which of the following are examples of the first specialized tissues? A. antennae B. eyes C. kidneys D. tentacles

Why is the immune system important to humans