Copy and complete these sentences using words from the list. You may use each word once, more than once or not at all blood , contracts , muscle , stretches , tubes , valves

The heart is made of . This muscle
and relaxes rhythmically, pumping blood around the
body. There are inside the heart that make sure the blood keeps flowing in the correct direction

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14) whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.