Untitled Flashcard Set

Animals are classified as __________, heterotrophic, eukaryotes that develop from embryonic layers.

multicellular

The primary nutritional mode of animals is __________, relying on consumption of organic material.

heterotrophic

The __________ is a rapid cell division of the zygote that occurs after fertilization.

cleavage

The __________ is a hollow ball of cells that serves as a precursor to the formation of the gastrula.

blastula

During gastrulation, the blastula reorganizes into a three-layered structure known as the __________.

gastrula

The three primary germ layers formed during gastrulation are ectoderm, mesoderm, and __________.

endoderm

The process by which some animals undergo a transformative change, akin to development, is called __________.

metamorphosis

A group of genes that provide important positional information during embryonic development are known as __________.

homeoboxes

The __________ theory suggests that increased atmospheric oxygen levels were critical for the diversification of animal life.

Atmospheric Oxygen

Animals exhibit two distinct development modes: __________ and deuterostomal.

protosome

Animals undergoing __________ cleavage experience a coiled arrangement of cells leading to determinate growth.

spiral

The __________ is the fate of the first opening formed during embryonic development in protostomes, typically becoming the mouth.

blastopore

Epithelial tissue that has multilayered cells is known as __________ epithelium.

stratified squamous

Simple columnar epithelium is commonly found in the __________ where it aids in digestion and nutrient absorption.

gastrointestinal tract

In terms of body cavities, __________ is a true body cavity formed from mesoderm allowing organs to grow independently.

coelom

__________ is a term for animals that lack a true body cavity, relying on diffusion for nutrient exchange.

Compact

Chordates belong to a clade known as __________, which exhibit bilateral symmetry.

Bilateria

The two major clades of bilaterian animals are Lophotrochozoa and __________.

Ecdysozoa

Thermoregulation is the process by which animals maintain their body temperature within a specific __________.

range

Ectothermic animals gain heat primarily through their __________, unlike endothermic animals that produce heat metabolically.

environment

Insulation, found at the body surface, serves to reduce the flow of __________ between an animal and its environment.

heat

The __________ is a specific value that the body aims to maintain for a physiological variable.

set point

Negative feedback mechanisms act to 'damp' the original __________, restoring balance in physiological variables.

stimulus

A __________ is defined as major adaptation that enables animals to save energy in times of difficult conditions.

torpor

The __________ is responsible for circadian clock regulation, hormone secretion, and body temperature control.

hypothalamus

The basal metabolic rate (BMR) is defined as the minimum metabolic rate of a nongrowing endotherm that is at __________.

rest

The __________ relationship between body size and energy demand suggests that smaller ectothermic animals have a higher metabolic rate relative to size.

inverse

During __________, an animal’s physiological adjustments to external changes will help it maintain homeostasis.

acclimatization

The process of generating body heat through metabolic means, often called 'muscle activity', is known as __________.

thermogenesis

Animals can enter a state of dormancy known as __________, characterized by decreased metabolic processes due to extreme heat.

estivation

The driving factors of climate include temperature, precipitation, sunlight, and __________.

wind

In ecology, __________ refers to the movement of individuals or gametes away from their area of origin or high population density.

dispersal

The study of interactions between organisms and their environment is known as __________ ecology.

organismal

Population ecology examines groups of individuals belonging to the same __________ living in a defined area.

species

In community ecology, researchers study a group of __________ living in a specific area.

populations

The focus of ecosystem ecology is on interactions between communities and their __________ environment.

physical

The __________ is a major type of ecological research that integrates both biotic and abiotic components across multiple ecosystems.

landscape ecology

An increase in __________ among species resulting from changes in climate and habitat can lead to increased biodiversity.

adaptation

Food scarcity during winter results in __________, a long-term torpor that allows animals to conserve energy.

hibernation