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![An 8-week fetus associated with a large (at least two-thirds of the... | Download Scientific Diagram An 8-week fetus associated with a large (at least two-thirds of the... | Download Scientific Diagram](https://www.researchgate.net/publication/267813307/figure/fig7/AS:341836414636034@1458511560058/An-8-week-fetus-associated-with-a-large-at-least-two-thirds-of-the-chorionic-sac.png)
An 8-week fetus associated with a large (at least two-thirds of the... | Download Scientific Diagram
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![The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BREATHING MECHANISM OF THE LAMPREYS. ^ forms a short tube connecting the gill sac with the exterior. The ental valves extend lat- erad The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BREATHING MECHANISM OF THE LAMPREYS. ^ forms a short tube connecting the gill sac with the exterior. The ental valves extend lat- erad](https://c8.alamy.com/comp/RHPD5Y/the-biological-bulletin-biology-zoology-biology-marine-biology-breathing-mechanism-of-the-lampreys-forms-a-short-tube-connecting-the-gill-sac-with-the-exterior-the-ental-valves-extend-lat-erad-and-at-the-same-time-dorsad-and-ventrad-to-the-outer-end-of-the-tubular-branchiopore-to-which-the-ectal-valve-is-attached-each-has-its-concave-face-outward-and-the-two-cover-about-two-thirds-of-the-lumen-of-the-branchiopore-each-overlaps-its-fellow-by-nearly-half-its-dorso-ventral-diameter-the-ectal-valve-is-a-thin-flg-10-the-external-branchiopore-show-membrane-which-is-attached-i-RHPD5Y.jpg)
The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BREATHING MECHANISM OF THE LAMPREYS. ^ forms a short tube connecting the gill sac with the exterior. The ental valves extend lat- erad
![The comparative physiology of respiratory mechanisms. Respiration. 126 RESPIRATORY MECHANISMS making up the vital capacity or two-thirds of the total is evidently completely renewed, but in the remaining third part renewal The comparative physiology of respiratory mechanisms. Respiration. 126 RESPIRATORY MECHANISMS making up the vital capacity or two-thirds of the total is evidently completely renewed, but in the remaining third part renewal](https://c8.alamy.com/comp/REF9J2/the-comparative-physiology-of-respiratory-mechanisms-respiration-126-respiratory-mechanisms-making-up-the-vital-capacity-or-two-thirds-of-the-total-is-evidently-completely-renewed-but-in-the-remaining-third-part-renewal-can-take-place-only-by-diffusion-in-the-narrow-but-numerous-circular-tracheal-branches-the-ventilation-tracheae-in-insects-generally-are-either-tubular-with-an-elliptic-cross-section-as-in-the-example-discussed-above-or-they-have-the-form-of-air-sacs-which-can-be-of-very-vary-ing-form-and-shape-from-very-numerous-small-vesi-cles-in-the-cockchafer-to-very-large-stru-REF9J2.jpg)
The comparative physiology of respiratory mechanisms. Respiration. 126 RESPIRATORY MECHANISMS making up the vital capacity or two-thirds of the total is evidently completely renewed, but in the remaining third part renewal
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