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No. An artery is defined by direction of flow—blood leaving the heart—not by how much oxygen it carries. In the systemic circuit, arteries usually deliver oxygen-rich blood to body tissues, but in the pulmonary circuit the pulmonary arteries carry oxygen-poor blood from the right side of the heart to the lungs for gas exchange. OpenStax’s … Read more
No. Abundant numbers can be odd; the first odd abundant number is 945, even though the smallest abundant numbers are even.
Agricultural implements are farming tools and equipment, including plows, harrows, cultivators and other implements used in soil preparation and crop production.
Yes. On Sept. 18, 2026 the FDA approved Aqneursa (levacetylleucine) as the first treatment for ataxia in patients with ataxia-telangiectasia weighing ≥15 kg.
No. Bird air sacs move air through the respiratory system; gas exchange happens in the lungs, not in the air sacs.
Yes. On September 18, 2026, the U.S. Food and Drug Administration granted full approval to Inluriyo (imlunestrant) in combination with Verzenio (abemaciclib) for adults with estrogen receptor–positive, HER2-negative, ESR1-mutated advanced or metastatic breast cancer after disease progression on at least one line of endocrine therapy. In the Phase 3 EMBER-3 trial, among patients whose tumors … Read more
Yes. Bryophytes are nonvascular land plants — mosses, liverworts, and hornworts — with more than 25,000 species, according to OpenStax Biology.
African wild dogs are classified as Endangered, with a declining population affected by habitat fragmentation, conflict and disease.
Yes. On September 17, 2026, researchers writing in Current Biology formally described Leopardus tilcayo, a small spotted tiger cat from Bolivia’s Yungas cloud forests—the first newly named living cat species in more than a century (since the Uruguayan pampas cat in 1923). Whole-genome analysis of 38 Leopardus samples showed the animals long lumped as “tiger … Read more
No. All living birds are endothermic—commonly called “warm-blooded”—meaning they generate and regulate body heat internally rather than relying mainly on the environment the way reptiles and amphibians do. Some birds do temporarily lower metabolism and body temperature in a controlled state called torpor (seen in hummingbirds, swifts, nightjars, and others), which can look “cold,” but … Read more