'A' in Biology

Can you identify the terms or people associated with biology that begin with the letter 'A'?

Forced Order Answers have to be entered in order
A blood vessel that conveys (in most vases oxygenated) blood from the heart to other parts of the body
A British naturalist, author and documentarian affiliated for much of his career with the British Broadcasting System (BBC)
A disease representing the late stage of infection with the human immunodeficiency virus (HIV), characterised by opportunistic infections that a healthy immune system could resist
A French-American naturalist of the 17th and 18th centuries, author and illustrator of a comprehensive ornithological guide titled The Birds of America
A large protein used by the immune system to identify and neutralise pathogens such as viruses and bacteria
A member of the class of invertebrates that includes spiders, scorpions, mites and ticks
A member of the class of mostly four-legged vertebrates that includes frogs, toads, salamanders and caecilians
A member of the order of mammals comprising hoofed, even-toed ungulates such as sheep, goats, pigs, deer and antelope
A single-celled organism that can change its shape by extending armlike projections of its cell membrane known as pseudopods
A vascular seed plant whose seeds develop in the ovary of a flower and are protected by a fruit
An ancient Greek philosopher and scientist, often credited as the first empirical biologist
An invertebrate species with an exoskeleton, a segmented body and paired, jointed legs or appendages; examples include arachnids, crustaceans, insects and myriapods
An organic compound from which proteins are constructed
An organism that produces its own food (and food for other organisms) by synthesising complex organic compounds through a process such as photosynthesis or chemosynthesis
Any of several South American snake species, the largest of which is the world’s heaviest snake
Describing a type of reproduction (such as budding, vegetative propagation or parthenogenesis) that does not involve the fusion of gametes
Describing an anatomical position near or in the direction of the head or foremost part of an animal
Describing an animal species or other taxon that resides predominantly in trees
Describing species or populations that occur in separate geographical areas that do not overlap
In mammal species, the portion of the body between the diaphragm and the pelvis; in insects, the hindmost of the three main segments of the body
In population biology, the phenomenon of increased individual fitness and survivorship associated with greater population size
One of four nucleobases that constitute the nucleic acids DNA and RNA; in DNA, it forms a base pair with the nucleobase thymine; in RNA, if forms a base pair with uracil
One of the two or more forms of a given gene variant
The biological kingdom whose most speciose phyla are Arthropods, Molluscs and Chordates
The bodily structure of a living organism, or the scientific study thereof
The clear liquid contained within an egg, which protects the yolk and provides supplemental nutrition for the growing embryo; commonly called egg white
The extraction via needle of amniotic fluid from the uterus of a pregnant female in order to screen for foetal abnormalities
The largest artery in the human body
The only mammal that is the sole species in its entire order
The stage of cell division during which replicated chromosomes separate themselves toward opposite poles of the mitotic or meiotic spindle

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