Which of the following is true about sponges and placozoans? a. They are both bilaterally symmetrical with endoderm, ectoderm, and mesoderm.
b. They are both asymmetrical. Placozoans have endoderm and ectoderm while sponges have no tissue.
c. They are both asymmetrical with endoderm and ectoderm.
d. They are both radially symmetrical with no tissue.

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c. ozone layer hole d. increase in sea levels

Will camels hump ahrinks. give reason

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the correspondingbones in whales have very different shapes and proportions. however, genetic data suggest that all three kindsof organisms diverged from a common ancestor at about the same time. which of the following is the mostlikely explanation for these data? a) humans and bats evolved by natural selection, and whales evolved by lamarckian mechanisms. b) forelimb evolution was adaptive in people and bats, but not in whales. c) natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy. d) genes mutate faster in whales than in humans or bats. e) whales are not properly classified as mammals.